Choosing the right telemarketing partner can transform your sales pipeline overnight.
With dozens of agencies claiming to deliver exceptional results, how do you identify the genuine performers from those who promise the world but deliver mediocre outcomes? The reality is that telemarketing companies vary enormously in quality, expertise, and effectiveness.
We’ve done the research for you. This comprehensive guide reviews the best B2B telemarketing companies operating in the UK right now, based on their track record, service quality, client results, and industry reputation.
1. The Lead Generation Company
Location: London, Glasgow, Manchester
Specialisation: Integrated B2B telemarketing and lead generation
Website: www.theleadgenerationcompany.co.uk
The Lead Generation Company stands as the UK’s leading integrated B2B telemarketing and lead generation agency. Since 2012, they’ve built an exceptional reputation for delivering qualified appointments, demos, and sales calls for businesses across virtually every B2B sector.
What sets them apart?
The Lead Generation Company’s clients convert up to 80% of the leads they generate into new business. This exceptional conversion rate reflects their rigorous qualification process and multi-touchpoint nurturing approach.
They don’t just make calls and pass on contact details. They qualify leads thoroughly through multiple channels, ensuring your sales team only invests time in genuine opportunities.
Who they work with
From ambitious startups to established enterprises, The Lead Generation Company supports B2B businesses of all sizes.
Why choose The Lead Generation Company?
- Over 80 years of collective sales and marketing experience within their management team
- 100% of services delivered in-house (no outsourcing to overseas call centres)
- Average 20% year-on-year growth since 2012
- Multi-award-winning agency
- Offices across the UK for nationwide coverage
- Proven track record across multiple industries
- Transparent reporting with full campaign visibility
- Flexible engagement models tailored to your budget
2. The Telemarketing Company
Location: Brighton
Specialisation: B2B outbound telemarketing and inside sales
Website:https://ttmc.co.uk/
Based on Brighton seafront, The Telemarketing Company has built a strong reputation for unscripted telemarketing services delivered by mature, trained agents.
With 200 workstations and a team of experienced telemarketers, they can handle projects of any scale. They work with organisations ranging from SMEs to global enterprises across multiple sectors, including financial services, IT, pharmaceuticals, and professional services.
Best for: Businesses requiring large-scale telemarketing campaigns with experienced, UK-based callers working unscripted.
3. MarketMakers
Location: Sheffield
Specialisation: B2B telemarketing and lead generation
Website:https://www.marketmakers.co.uk/
MarketMakers built a strong reputation as one of the UK’s leading B2B telemarketing agencies before being acquired by the Ant Marketing Group. They focus on attracting sales talent capable of achieving “the best possible outcome from every call.”
They work across various sectors, including utilities, banking, insurance, manufacturing, and professional services. Their approach emphasises intelligent conversation over volume, aiming to engage decision makers in sectors with longer sales cycles.
Best for: Businesses in sectors with long sales cycles where relationship-building through telephone engagement is essential.
4. Blue Donkey
Location: Cambridge area
Specialisation: Intelligent B2B telemarketing
Website:https://www.bluedonkey.co.uk/
Blue Donkey pioneered the concept of “intelligent telemarketing” – emphasising quality conversations over scripted volume calling.
They’re ISO 9001 accredited and focus exclusively on B2B telemarketing (they never engage in B2C calling). Their boutique model emphasises building relationships through genuinely intelligent conversations tailored to each buyer’s needs.
Best for: Companies seeking a boutique telemarketing partner with a focus on intelligent, unscripted conversations with senior decision makers.
5. Virtual Sales Limited
Location: Horsham
Specialisation: Telemarketing and direct marketing
Website: https://www.virtual-sales.com/
Virtual Sales Limited is a UK-based telemarketing company that focuses on providing flexible telemarketing services with an emphasis on building rapport and securing qualified appointments.
Their approach centres on professional telephone engagement supported by data-driven targeting to ensure calls reach the right decision makers at the right time.
Best for: Businesses wanting UK-based telemarketing support with flexible engagement models.
6. GCL Direct
Location: Oldbury, West Midlands
Specialisation: B2B telemarketing with unscripted approach
Website:https://www.gclb2b.com/
GCL Direct (now trading as GCL B2B) has established an enviable reputation over more than 30 years. With over 50 experienced telemarketers, many of whom are multilingual, they handpick teams for each campaign based on sector knowledge and experience.
Best for: Businesses seeking an experienced UK telemarketing partner with a non-scripted, consultative approach and proven ROI track record.
7. Amvoc
Location: Harrogate
Specialisation: B2B and B2C telemarketing
Website: https://www.amvoc.co.uk/
Amvoc provides both B2B and B2C telemarketing services, with specialisations in lead generation, appointment setting, and market research. They offer multilingual telemarketing capabilities, providing services in German, Danish, Hindi, Punjabi, Italian, Spanish, and other languages.
Best for: Businesses requiring multilingual telemarketing capability or those operating across multiple European markets.
8. Air Marketing
Location: Exeter
Specialisation: Outsourced B2B sales and marketing
Website:https://www.air-marketing.co.uk/
Air Marketing positions itself as an end-to-end outsourced sales and marketing agency. They’ve provided telemarketing as part of a comprehensive service offering that includes digital marketing and demand generation.
Best for: Businesses seeking comprehensive outsourced sales and marketing support beyond just telemarketing.
9. River B2B
Location: Hampshire
Specialisation: Outsourced telemarketing and lead generation
Website: https://www.riverb2b.com/
River B2B is a professional outsourced telemarketing and lead generation company based in Hampshire. They work with businesses from all sectors to grow sales revenue through telemarketing, lead generation, and appointment setting.
Best for: Businesses looking for UK-based telemarketing support with EMEA capability.
10. DSC Telemarketing
Location: Stockport
Specialisation: B2B telemarketing and appointment setting
Website: https://www.dsc-marketing.co.uk/
DSC Telemarketing is a Business to Business telemarketing agency based in Stockport, providing comprehensive telemarketing services throughout the UK. They focus on booking appointments directly into client calendars and building sales pipelines.
Best for: Businesses wanting straightforward B2B appointment setting services from a regional UK agency.
How to Choose the Right Telemarketing Partner
Now that you’ve seen the options, how do you make the right choice? Consider these critical factors:
Single-Channel vs. Integrated Approach
Does the agency offer just telemarketing, or do they integrate it with other channels? Single-channel agencies limit your reach. The best results come from multi-touchpoint campaigns that nurture prospects across multiple channels.
Quality of Telemarketers
Are calls scripted or conversational? Are callers experienced professionals or transient staff reading from scripts? The quality of the people representing your brand on calls matters enormously.
Ask about average agent tenure, training programs, and whether calls are scripted or structured. The best agencies employ mature, experienced telemarketers who can have genuine business conversations.
Data Quality
What’s their data accuracy guarantee? Poor data means wasted calls to wrong numbers and outdated contacts. Look for agencies offering 95%+ accuracy guarantees.
The Lead Generation Company’s 98% accuracy guarantee is industry-leading and reflects their commitment to data quality.
Qualification Process
How do they qualify leads before passing them to your sales team? Ask about their specific qualification criteria and what must be met before a lead is considered sales-ready.
Track Record and Results
Can they demonstrate proven results with specific case studies and conversion rate data? Don’t accept vague promises – demand concrete evidence of success with businesses similar to yours.
Scale and Flexibility
Do they have the capacity to handle your volume requirements? Can they scale up or down based on results? Understand their minimum commitments and contract terms.
Transparency and Reporting
Will you have visibility into campaign performance? Can you access real-time data on calls made, conversations had, and appointments booked?
Avoid agencies that are secretive about their methods or provide only high-level summary reports.
Integration Capability
Can they integrate with your existing CRM and sales processes? Seamless integration ensures leads flow directly into your systems without manual administration.
Read more: 10 Questions To Ask Before Hiring a B2B Lead Generation Company.
Ready to Transform Your Telemarketing Results?
The Lead Generation Company has spent over a decade perfecting the art of B2B telemarketing as part of an integrated lead generation strategy. Their proven track record speaks for itself – clients converting up to 80% of generated leads into new business, rigorous qualification processes, and a multi-channel approach that addresses how modern buyers actually make decisions.
Get in touch for an honest conversation about your telemarketing needs. No pressure, no hard sell – just straight-talking advice about whether they’re the right fit for your business and what results you can realistically expect.
Frequently Asked Questions
What’s the difference between telemarketing and telesales?
Telemarketing typically focuses on lead generation, appointment setting, and market research – nurturing prospects and identifying opportunities for your sales team. Telesales involves actually closing deals over the phone, taking orders, and securing commitments. Many agencies offer both, but the skill sets required differ significantly.
Should I use UK-based or offshore telemarketers?
For B2B sales targeting UK decision makers, UK-based telemarketers are almost always more effective. They understand business culture, don’t have accent barriers, work in the same time zones, and can build genuine rapport. Offshore calling might seem cheaper initially, but lower conversion rates mean it often costs more in the long run.
How quickly will I see results from telemarketing?
Well-executed B2B telemarketing can deliver qualified appointments within 2-4 weeks of campaign launch. However, the timeline depends on factors like your target market accessibility, offer complexity, and average sales cycle length. Be wary of agencies promising hundreds of leads in the first week – these are usually low-quality contacts.
Do I need to provide the data, or will the agency provide it?
Different agencies have different models. Some work only with your existing data, others provide their own data services, and the best (like The Lead Generation Company) offer both options with high accuracy guarantees. Using agency-provided B2B data with 98% accuracy often delivers better results than working with outdated internal databases.