10 Best Telemarketing Companies for Marketing & Advertising

Selling marketing and advertising services is a strange kind of irony. You’re in the business of helping other companies grow, but when it comes to filling your own pipeline, the toolbox often goes untouched. Internal new business gets deprioritised whenever client work picks up, and before long the pipeline has gone quiet.

It’s a common cycle, and it’s one of the main reasons agencies turn to telemarketing. A good telemarketing partner will get your agency in front of decision-makers who are actively looking for what you offer, or who should be. But this is a sector where the quality of the conversation matters more than the volume of calls. Marketing directors and business owners get pitched by agencies every week. They’ll shut down a generic cold call within seconds.

That means the telemarketing company you choose needs to understand how agencies sell, what makes your positioning different from the next agency down the road, and how to articulate that in a way that earns a meeting. We’ve put together this list to help you find the right fit.

1. The Lead Generation Company

Location: Glasgow, London, Manchester

Specialisation: Integrated B2B telemarketing and lead generation

Website: www.theleadgenerationcompany.co.uk

The Lead Generation Company is a multi-award-winning B2B lead generation agency that’s been delivering stellar results since 2012. They combine telemarketing, LinkedIn outreach and email campaigns to generate fully qualified appointments for businesses across a wide range of sectors, including marketing and advertising.

What Sets The Lead Generation Company Apart?

What makes TLGC stand out is the calibre of their team. Their in-house telemarketers average 15 years of B2B sales experience, and every campaign is run entirely from their UK offices. There’s no outsourcing, no junior staff reading from scripts, and no offshore call centres. Conversations are natural, intelligent and tailored to the prospect’s specific role and pain points.

For marketing and advertising agencies, this is critical. The people you’re trying to reach are marketing professionals themselves. They know what a scripted sales call sounds like, and they won’t tolerate one. You need someone on the phone who can hold an authoritative conversation about marketing challenges, understand what agencies actually do, and position your services in a way that cuts through the noise.

Why Choose The Lead Generation Company for Marketing and Advertising?

• 98% data accuracy guarantee on all B2B data
• 100% of services delivered in-house from UK offices
• Over 80 years of collective sales and marketing experience in their management team
• Multi-channel campaigns combining telemarketing, LinkedIn and email
• Flexible campaigns tailored to your budget and target market
• Transparent reporting with full campaign visibility

Best for: Marketing and advertising agencies of all sizes wanting a fully managed, multi-channel lead generation campaign backed by experienced UK-based telemarketers.

2. Alchemis

Location: London

Specialisation: New business development for marketing, creative and communications agencies

Website: alchemis.co.uk

Alchemis has been operating exclusively in the marketing and communications sector since 1986, making them one of the longest-established specialists in this space. Their entire business is built around helping agencies win new clients, and their senior team has over 100 years of collective experience in agency new business development.

They use a combination of telephone outreach, email and strategic positioning to generate qualified opportunities with marketing decision-makers. What sets them apart is their proprietary database of UK and international marketing decision-makers, built over nearly four decades of working solely with agencies. If you’re a creative, digital, PR or communications agency, Alchemis will understand your positioning challenges better than most generalist providers.

Best for: Creative, communications and marketing agencies wanting a specialist new business partner with deep, long-standing sector expertise.

3. The Telemarketing Company

Location: Brighton

Specialisation: B2B outbound telemarketing and inside sales

Website: ttmc.co.uk

The Telemarketing Company is one of the UK’s largest B2B telemarketing agencies, with 200 workstations and a team of experienced, salaried callers. They hold ISO 9001 and ISO 27001 accreditations, which can be useful if you’re working with clients in regulated sectors or need to demonstrate compliance standards in your own supply chain.

Their callers don’t work from rigid scripts. They’re trained to have unscripted, consultative conversations, which is exactly what you’ll need when reaching out to marketing directors who’ll spot a canned pitch immediately. Their scale means they can handle large campaigns with significant call volumes while maintaining quality, and they’ve worked across professional services, technology and other B2B sectors for over 20 years.

Best for: Agencies needing large-scale, UK-based telemarketing campaigns with experienced callers and strong compliance credentials.

4. The Hand

Location: London

Specialisation: New business development for creative and marketing agencies

Website: thehand.co.uk

The Hand is a specialist new business agency that works exclusively with the creative, digital, design and marketing industry. They’re not a generalist telemarketing company that happens to serve agencies. Their entire model is built around helping agencies win new clients through relationship-led outreach, pipeline management and strategic positioning.

They also run thought-leadership events designed to create meaningful conversations with the right brands. If your agency’s challenge is getting into rooms with the right procurement teams and brand-side decision-makers, The Hand’s combination of positioning work and outreach is worth considering.

Best for: Creative, digital and marketing agencies that want a specialist new business partner who understands agency procurement dynamics.

5. Sopro

Location: Brighton, with offices in London, Dubai and Miami

Specialisation: Multi-channel B2B prospecting

Website: sopro.io

Sopro is a fully managed prospecting service that runs personalised email and LinkedIn campaigns on your behalf. They’ve built a specific offering for marketing, advertising and creative agencies, which is a good sign that they understand the particular challenges of selling agency services.

Their campaigns use over 160 data points per prospect to build bespoke target lists, and every contact is verified and GDPR-compliant. You’ll get a dedicated campaign team and a live portal where you can track performance in real time. Sopro has run over 8,000 campaigns across 80+ sectors and has a strong reputation for email deliverability and consistent results. Their model is less phone-heavy than some others on this list, so they’re best suited to agencies that prefer digital-first outreach.

Best for: Agencies wanting precision-targeted email and LinkedIn prospecting with a dedicated team managing everything.

6. GSA Business Development

Location: London

Specialisation: B2B telemarketing, appointment setting and lead generation

Website: gsa-marketing.co.uk

GSA Business Development is a London-based telemarketing and lead generation agency with a senior-level team. Their directors bring backgrounds from brands like Porsche, Montblanc and American Express, which gives their work a commercial edge that goes beyond basic cold calling.

They offer B2B telemarketing, database building, LinkedIn outreach and telemarketing training for in-house teams. Their model is consultative, starting with a strategy workshop before any calls are made. They also offer multilingual campaigns through a network of international partners, which is useful if your agency targets clients outside the UK. GSA is particularly well suited to agencies that want a methodical, strategy-first partner rather than a pure volume play.

Best for: Agencies looking for a consultative, strategy-led telemarketing partner with strong senior-level commercial experience.

7. Air Marketing

Location: Exeter

Specialisation: Outsourced sales and marketing

Website: air-marketing.co.uk

Air Marketing positions itself as a full outsourced sales and marketing function, covering telemarketing, digital marketing and demand generation under one roof. Their model is suited to agencies that need support beyond just telemarketing, including campaign strategy, content and nurture programmes.

For marketing agencies that don’t have an internal new business function, Air Marketing can effectively act as your sales team, handling prospecting and appointment setting while you focus on servicing existing clients. They’re based in Exeter but work with clients across the UK.

Best for: Agencies that need a broader outsourced sales and marketing function, not just telemarketing.

8. Callbox

Location: Global, with UK delivery capabilities

Specialisation: AI-powered multi-channel lead generation

Website: callboxinc.com

Callbox is one of the largest outsourced B2B lead generation providers globally, with over 20 years of experience and more than 10,000 campaigns delivered. They combine phone, email, LinkedIn, chat and digital events into a single multi-channel outreach programme, powered by their proprietary Smart Engage platform.

Their strength is scale. If your agency is looking to break into new markets or run high-volume campaigns targeting multiple verticals at once, Callbox can handle it. They also offer AI-driven lead scoring and ICP targeting, which helps prioritise the prospects most likely to convert. Keep in mind that Callbox is a global operation, so if you specifically need UK-based callers representing your brand, clarify this during the scoping process.

Best for: Agencies targeting international or large-scale markets that need AI-powered prospecting and multi-channel outreach at volume.

9. Blue Donkey

Location: Cambridge area

Specialisation: Intelligent B2B telemarketing

Website: bluedonkey.co.uk

Blue Donkey pioneered what they call “intelligent telemarketing,” which means prioritising quality conversations over scripted volume calling. They’re ISO 9001 accredited and focus exclusively on B2B. They never do B2C calling.

Their boutique model is built around building genuine rapport with prospects through thoughtful, tailored conversations. They’ve worked across technology and professional services, and their callers are trained to handle complex propositions. For agencies with a niche specialism or a more complex service offering that doesn’t lend itself to a quick elevator pitch, Blue Donkey’s conversational style can work well.

Best for: Agencies with complex or niche propositions that need a boutique telemarketing partner focused on quality over quantity.

10. Shortlist Marketing

Location: UK-based

Specialisation: B2B lead generation and sales growth

Website: shortlistmarketing.co.uk

Shortlist Marketing has been helping B2B businesses grow since 2010. They use a combination of LinkedIn, email marketing, video outreach, personalised one-to-one emails and targeted calling to generate qualified sales opportunities.

What stands out is their consultative approach. They start with a deep dive into your business, your market and your competitors before building a campaign. Their team integrates directly into HubSpot CRM to manage prospect nurturing, which is a practical advantage for agencies already using HubSpot. They also offer data building and cleansing services, which is useful if your existing prospect database needs work before any outreach begins.

Best for: Agencies that want a hands-on, consultative lead generation partner with strong CRM integration and a multi-channel approach.

How to Choose the Right Telemarketing Partner for Your Agency

Every agency’s new business needs are different. But there are a few things worth thinking about before you commit.

Do They Understand How Agencies Sell?

Selling agency services is fundamentally different from selling software or manufacturing equipment. The buyer psychology, the objections and the competitive dynamics are all specific to this sector.

Some of the companies on this list specialise exclusively in working with agencies. Others are strong generalists with experience across multiple industries. Both can work, but make sure whoever you choose can demonstrate they understand the agency world.

Are the Callers Experienced Enough for Your Audience?

Marketing directors and CMOs are a tough audience. They know what a sales pitch sounds like, and they’ll end the call quickly if the person on the phone can’t hold a credible conversation about their challenges.

Ask about the experience level of the callers who’ll be working on your campaign. Junior staff or offshore teams will struggle to represent your agency credibly to this audience.

What Does “a Lead” Actually Mean?

Lead generation pricing models vary enormously. Some agencies charge per lead, others work on monthly retainers, and some offer performance-based models. Make sure you understand what “a lead” actually means in the context of each provider.

A diary appointment with a qualified decision-maker is worth significantly more than a name and email address.

Don’t Overlook Data Quality

The foundation of any telemarketing campaign is the data it runs on. Ask every provider about their data accuracy, how often records are refreshed, and whether they’re GDPR-compliant. Poor data means wasted calls to wrong numbers, bounced emails and a damaged reputation with the very people you’re trying to impress.

If you’re ready to build a more consistent new business pipeline for your agency, start by speaking to a few of the companies on this list. The right partner won’t just generate leads. They’ll help you have better conversations with the right decision-makers, more often.

What Sets The Lead Generation Company Apart?

What sets TLGC apart is the quality and experience of their team. Their in-house telemarketers average 15 years of B2B sales experience, and every campaign is run entirely in-house. There’s no outsourcing, no junior staff and no scripts. Instead, conversations are natural, intelligent and tailored to the prospect’s specific role and pain points.

For marketing and advertising agencies, this matters enormously. Marketing directors and business owners are pitched by other agencies constantly. They’re not going to engage with a generic cold call. They need to speak with someone who can hold an authoritative conversation, understands what agencies actually do, and knows how to position your services in a way that cuts through the noise.

Why Choose The Lead Generation Company for Marketing and Advertising?

• 98% data accuracy guarantee on all B2B data
• 100% of services delivered in-house from UK offices
• Over 80 years of collective sales and marketing experience in their management team
• Multi-channel approach combining telemarketing, LinkedIn and email
• Flexible campaigns tailored to your budget and target market
• Transparent reporting with full campaign visibility

Best for: Marketing and advertising agencies of all sizes wanting a fully managed, multi-channel lead generation campaign backed by experienced UK-based telemarketers.

2. The Hand

Location: London

Specialisation: New business development for creative and marketing agencies

Website: thehand.co.uk

The Hand is a specialist new business agency that works exclusively with the creative, digital, design and marketing industry. This isn’t a generalist lead generation company that happens to serve agencies. Their entire model is built around helping agencies win new clients.

They offer relationship-led outreach, pipeline management, strategic positioning and thought-leadership events designed to create meaningful conversations with the right brands. If you’re a creative or marketing agency that needs a partner who genuinely understands agency positioning and how procurement works on the client side, The Hand is worth a serious look.

Best for: Creative, digital and marketing agencies that want a specialist new business partner with deep sector knowledge.

3. Sopro

Location: Brighton, with offices in London, Dubai and Miami

Specialisation: Multi-channel B2B prospecting

Website: sopro.io

Sopro is a fully managed prospecting service that runs personalised email and LinkedIn campaigns on your behalf. They’ve built a dedicated offering for marketing, advertising and creative agencies, which is a good indicator that they understand the specific challenges of selling agency services.

Their campaigns use over 160 data points per prospect to build bespoke target lists, and every contact is verified and GDPR-compliant. You’ll get a dedicated campaign team and a live portal where you can track performance in real time. Sopro has run over 8,000 campaigns across 80+ sectors and has a strong reputation for email deliverability and consistent results.

Best for: Agencies wanting precision-targeted email and LinkedIn prospecting with a dedicated team managing everything.

4. Callbox

Location: Global, with UK delivery capabilities

Specialisation: AI-powered multi-channel lead generation

Website: callboxinc.com

Callbox is one of the largest outsourced B2B lead generation providers globally, with over 20 years of experience and more than 10,000 campaigns delivered. They combine phone, email, LinkedIn, chat and digital events into a single multi-channel outreach programme, powered by their proprietary Smart Engage platform.

Their strength is scale. If you’re an agency looking to break into new markets or run high-volume campaigns, Callbox can handle it. They also offer AI-driven lead scoring and ICP targeting, which helps prioritise the prospects most likely to convert. Bear in mind that Callbox is a global operation, so if you specifically need UK-based callers representing your brand, it’s worth clarifying this during the scoping process.

Best for: Agencies targeting international or large-scale markets that need AI-powered prospecting and multi-channel outreach.

5. Shortlist Marketing

Location: UK-based

Specialisation: B2B lead generation and sales growth

Website: shortlistmarketing.co.uk

Shortlist Marketing has been helping B2B businesses grow since 2010. They use a combination of LinkedIn, email marketing, video outreach, personalised one-to-one emails and targeted calling to generate qualified sales opportunities.

What stands out is their consultative approach. They start with a deep dive into your business, your market and your competitors before building a campaign. Their team works closely with your sales function, and they integrate directly into HubSpot CRM to manage prospect nurturing. They also offer data building and cleansing services, which is useful if your existing prospect database needs work.

Best for: Agencies that want a hands-on, consultative lead generation partner with strong CRM integration.

6. Punch! B2B

Location: London

Specialisation: SDR-as-a-Service and account-based marketing

Website: punchb2b.com

Punch! B2B is a London-based agency that blends creative prospecting with structured sales development. They offer SDR-as-a-Service and ABM-as-a-Service, making them a good option for agencies targeting larger enterprise accounts where standard lead generation approaches tend to fall flat.

Their campaigns combine strategic account intelligence, multi-touch outbound sequences and creative content to break into accounts that have multiple stakeholders and longer procurement cycles. They’ve worked with well-known enterprise brands and are particularly strong in complex, high-value B2B environments.

Best for: Agencies targeting enterprise-level clients where account-based marketing and creative outbound are needed.

7. Pearl Lemon Leads

Location: London

Specialisation: Outbound B2B lead generation and cold email

Website: pearllemonleads.com

Pearl Lemon Leads is part of the wider Pearl Lemon group and focuses on outbound lead generation through cold email, LinkedIn outreach and SEO-driven inbound. They work across B2B and B2C, with clients in professional services, technology, property and other sectors.

Their approach is flexible, offering both retainer-based and project-based models. They’re a practical choice for smaller agencies or startups looking to test outbound lead generation without committing to a large retainer from day one.

Best for: Smaller agencies or startups wanting flexible, scalable outbound lead generation.

8. Air Marketing

Location: Exeter

Specialisation: Outsourced sales and marketing

Website: air-marketing.co.uk

Air Marketing positions itself as a full outsourced sales and marketing function, covering telemarketing, digital marketing and demand generation under one roof. Their model is particularly suited to businesses that need support beyond just lead generation, including campaign strategy, content and nurture programmes.

For marketing agencies that lack an internal new business function, Air Marketing can effectively act as your sales team, handling prospecting and appointment setting while you focus on servicing existing clients. They’re based in Exeter but work with clients across the UK.

Best for: Agencies that need a broader outsourced sales and marketing function, not just lead generation.

9. The Telemarketing Company

Location: Brighton

Specialisation: B2B outbound telemarketing

Website: ttmc.co.uk

The Telemarketing Company is one of the UK’s largest B2B telemarketing agencies, with 200 workstations and a team of experienced, unscripted callers. They hold ISO 9001 and ISO 27001 accreditations, which can be important if you’re working with clients in regulated sectors or need to demonstrate compliance standards.

Their scale means they can handle large campaigns with significant call volumes. They work across multiple sectors, including professional services and technology, and their telemarketers are salaried, experienced staff instead of transient call centre agents.

Best for: Agencies needing large-scale, UK-based telemarketing campaigns delivered by accredited professionals.

10. Lead Gen Department

Location: Norwich

Specialisation: Telemarketing and appointment setting

Website: leadgendept.com

Lead Gen Department focuses on telemarketing-led lead generation for B2B companies, with a particular emphasis on technology and professional services sectors. They’ve built a reputation for delivering a guaranteed minimum number of qualified meetings, or they continue working at no extra cost for up to an additional month.

Their UK-based callers focus on building rapport with prospects and booking qualified appointments instead of high-volume dialling. For agencies that value a personal, phone-first approach and want confidence in meeting volumes, this guarantee model is worth considering.

Best for: Agencies wanting a performance-backed, telephone-led approach with a meeting guarantee.

How to Choose the Right Partner for Your Agency

Every agency’s new business needs are different, so there’s no single right answer. But there are a few things worth considering before you commit.

Match the Approach to Your Market

If you’re targeting CMOs and marketing directors at large brands, you’ll want a partner that can handle multi-stakeholder engagement and longer sales cycles. If you’re going after SMEs and owner-managed businesses, a phone-first approach might work better.

Check for Sector Experience

Some of the companies on this list have specific experience working with marketing and advertising agencies. That matters because selling agency services is fundamentally different from selling software or manufacturing equipment. The messaging, the objections and the buyer psychology are all different.

Understand What You’re Paying For

Lead generation pricing models vary enormously. Some agencies charge per lead, others work on monthly retainers, and some offer performance-based models. Make sure you understand what “a lead” actually means in the context of each provider. A diary appointment with a qualified decision-maker is worth far more than a name and email address.

Don’t Neglect Data Quality

The foundation of any lead generation campaign is the data it runs on. Ask every provider about their data accuracy, how often records are refreshed, and whether they’re GDPR-compliant. Poor data means wasted calls, bounced emails and damaged brand reputation.

If you’re ready to build a more consistent new business pipeline for your agency, start by speaking to a few of the companies on this list. The right partner won’t just generate leads. They’ll help you have better conversations with the right people, more often.