10 Best CRM Agencies In The UK (2026)

CRM covers two quite different jobs in the UK agency market: lifecycle marketing to existing customers, and the setup of sales and customer data systems.

In this article, I’ll compare 10 agencies offering CRM services in the UK in 2026, with a profile of each one and a checklist for picking between them so you can make the right choice and not regret it later in a 12-month locked-in contract.

TL;DR

• Underground Ecom offers the best CRM agency in the UK for ecommerce and DTC brands, backed by our 120-person retention team and was named Klaviyo’s Agency Partners of the Year for EMEA in 2025.
• Flourish suits larger consumer brands that want one specialist partner covering CRM solution design, implementation, creative and day-to-day delivery on enterprise platforms such as Braze and Salesforce.
• WeDoCRM fits in-house CRM teams that need extra specialist capacity, supplied through the agency’s Insourced Model on capped or uncapped retainers.

What are the best CRM agencies in the UK in 2026?

The best CRM agency in the UK for ecommerce and DTC brands is Underground Ecom, which runs lifecycle CRM through Klaviyo with a dedicated retention team on each account.

Every brand is also benchmarked against performance data from 500 DTC brands through Underground Ecom’s own Underground Insights tool.

Note on how I selected these companies: Each agency on this shortlist is based in the UK, lists CRM as a named service on its own website, and was working with clients in 2026.

The shortlist mixes lifecycle marketing specialists with sales CRM implementation partners, and the “Best for” column shows which type each agency is.

#1: Underground Ecom

Underground Ecom is a retention agency running email, SMS and WhatsApp programmes for ecommerce and DTC brands.

Each account gets a dedicated team, led day-to-day by a CRM Director and a CRM Manager, with designers and copywriters on creative.

We’ve noticed that growing UK brands tend to hit the same CRM problems once the account has been running for a while:

• Flat revenue on a growing list: subscribers keep rising while email revenue stays flat.
• Flows left untouched: sequences built years ago still run with no testing.
• Whole-list sends: campaigns go to everyone because nobody has built proper segments.
• Hidden deliverability issues: one mailbox provider flagging your emails as spam can drag down inbox placement for months.

This is why our work starts with a CRM audit that finds those gaps and puts a revenue figure on fixing each one.

In 2025, Klaviyo named us one of its Agency Partner of the Year recipients for EMEA, and we hold its Master Elite Partner tier.

That same year, our team of 120 retention specialists generated $400m in revenue for client brands.

Here’s what you can expect by working with us:

A dedicated retention team on every account

Each brand Underground Ecom works with gets a full multi-disciplinary team, and the senior strategists involved in the pitch keep working on the account afterwards.

A typical setup includes:

• A CRM Director acting as operational owner of the account.
• A CRM Manager responsible for day-to-day execution of flows and campaigns.
• Graphic designers and copywriters dedicated to the brand’s creative.
• A senior strategy layer made up of Client Director Pieter, Head of CRM Mike and Strategy Director Stefan, providing senior Klaviyo expertise and shaping the long-term roadmap.

   

  

💡 We’re also growing our UK team with new senior hires and building a dedicated implementation and data function inside the agency.

Underground Insights

Every client also gets free access to Underground Insights, our in-house benchmarking and reporting tool.

Underground Insights draws on performance data from 500 DTC brands to measure each account’s flow performance and deliverability signals against top performers in the same vertical.

Our software sorts customers into cohorts to show who is most likely to buy again, and it flags falls in flow revenue as they happen.

What does working with Underground Ecom look like? CRM Audit & Roadmap

New partners often begin with the Underground Ecom CRM Audit & Roadmap, a two- to three-week engagement that finishes with a short impact report, which senior strategists then talk through with the brand’s team in a live session.

The audit runs through four stages:

• Deep data analysis.
• Competitor benchmarking.
• Retention strategy mapping.
• A growth roadmap ranked by revenue impact.

💡 Klaviyo accounts are the most common starting point, though Underground Ecom also audits programmes built on Dotdigital, SendGrid, Braze and Bloomreach.

Results from recent CRM work

Fixing those CRM gaps has delivered measurable gains for brands in subscription wellness, beauty and gifting, including:

• AG1: a rebuilt flow ecosystem based on behaviour-driven personalisation lifted flow revenue by 18% and brought in 75,000 new subscribers in 2025.
• Huda Beauty: an audit ahead of BFCM 2024, followed by strategy support, delivered over £10m in Klaviyo revenue and a 673% year-on-year uplift.
• Virgin Experience Days: consolidating more than 15 flows and 85 emails across Dotdigital and SendGrid produced 68% open rates and a 9% lift in click rate.

   

  

Services

• CRM Audit & Roadmap, benchmarked through Underground Insights.
• Lifecycle strategy and journey mapping from first purchase to winback.
• Automated journeys from the welcome series through post-purchase, cross-sell, winback and sunset flows, plus abandonment recovery.
• Campaign calendars with copy, design and build handled in-house.
• Customer segmentation using Klaviyo profile data.
• Regular split tests on subject lines, send times and offers.
• Deliverability monitoring and list hygiene.
• SMS, WhatsApp, loyalty and direct mail planned alongside email.
• Cohort analysis and revenue reporting.
• Migrations into Klaviyo from other email platforms.

#2: Fixate

Fixate is a London CRM marketing agency handling email, push and SMS for ecommerce, retail, service and subscription brands.

Its engagements follow five named stages, Cultivate, Convert, Commit, Clarify and Calibrate, taking a brand from capturing data at every touchpoint through to post-purchase engagement and ongoing testing.

Services

• Lifecycle automations and one-off campaigns.
• Split testing and data insight reporting.
• Segmentation and deliverability management.
• Signup form optimisation for zero-party data capture.
• Copywriting and design for every email.
• Loyalty programme support.

#3: Flourish

Flourish is a specialist CRM agency with UK offices in Bristol and London, plus a base in Dubai, suited to large brands that run CRM across several platforms.

The Flourish team builds programmes meant to feel like real relationships with customers, and works with partners including Braze, Salesforce, Adobe, Bloomreach, Microsoft Dynamics 365, Customer.io, Dotdigital, MoEngage and Klaviyo.

Services

• Solution Design work that settles platform, data and use case choices up front.
• CRM build and rollout, with Flourish managing stakeholders through launch.
• Continuous optimisation driven by test results.
• Programme and journey planning based on audience insight.
• CRM-first creative that scales across channels.
• Campaign delivery handled as part of the client’s own team.

#4: WeDoCRM

Known as The Insourced CRM Agency, WeDoCRM places CRM specialists inside a client’s existing team from its London base, with capped or uncapped retainers to choose from.

Under the WeDoCRM Insourced Model, the system-agnostic team works to the client’s own processes and chat tools, bringing platform knowledge across Salesforce, HubSpot, Dotdigital and Customer.io.

Services

• Before and after audits of CRM and MarTech systems.
• Moving brands onto a new CRM or ESP, then implementing it.
• Data-led CRM strategy.
• Campaign planning and execution across channels.
• Email design and coding that renders well on mobile and in dark mode.
• GDPR process setup and compliance guidance.
• Custom MarTech development.

#5: ChameleonCRM

Braze and Klaviyo partner ChameleonCRM, based in Ellesmere Port in Cheshire, works with brands either as a long-term CRM partner or on a standalone audit.

Recent ChameleonCRM projects include a Braze migration and a modular template system that lets campaign teams assemble emails from reusable content blocks.

Services

• Standalone CRM audits.
• Platform migrations and technical delivery.
• Customer experience mapping.
• Strategic management of the CRM programme over time.
• A dedicated CRM partner model for long-term support.
• Modular templates built from reusable content blocks.

#6: THE CRM Agency

THE CRM Agency is a Hertfordshire eCRM specialist built around what its founders call the Art and Science of CRM, pairing strong creative with careful segmentation and data analysis.

THE CRM Agency co-founder Jason Holland leads the creative side hands-on, and brands can pick anything from running campaigns themselves to full management of every send.

Services

• ESP selection and advice on existing suppliers.
• HTML email development and asset production.
• CRM strategy with clear objectives for each campaign.
• Segmentation models built from behavioural and demographic data.
• Journey planning workshops and wireframes.
• Creative design for CRM communications.
• Campaign management, from self-serve setups to full outsourcing.
• Performance analysis and reporting.

#7: Impression

Impression is a performance marketing agency with offices in Nottingham, London and Manchester, and its CRM team links customer data to paid media so brands can measure true acquisition costs and lifetime value.

Services

• Choosing, onboarding and migrating CRM platforms.
• Connecting the CRM to ad platforms, analytics and Looker Studio reporting.
• Klaviyo automation management with periodic health checks.
• Inbound marketing for B2B service businesses.
• Data maturity audits and ongoing data quality reviews.
• Data warehousing where native syncing is not available.
• One-to-one CRM training.

#8: Times One Hundred

Artists, labels and entertainment brands make up a large share of the email and CRM work at Times One Hundred, a London agency that also runs paid media and SEO.

Times One Hundred holds Klaviyo Gold Partner status and uses Klaviyo to reactivate fanbases around new releases, alongside data platform setup and GDPR-compliant data handling.

Services

• Klaviyo setup, segmentation and automated flows.
• Behaviour-triggered drip campaigns.
• Integrating the CRM with the email platform.
• Data warehouse and data platform builds.
• Migrations and privacy compliance work.

#9: Catalyst

Catalyst Marketing Agency works on the sales side of CRM, helping SMEs get HubSpot, Salesforce, Pipedrive or Zoho set up properly and adopted by the people who use them daily.

Catalyst is a HubSpot Diamond Partner with offices in Birmingham and London, and it builds team training into each project so the CRM becomes part of everyday sales work.

Services

• Setting up and onboarding a new CRM.
• Reviewing and improving a CRM already in use.
• Team training plus ongoing access to CRM specialists.
• Sales funnel design with lead nurturing and bottleneck tracking.
• Segmented data and personalised outreach.
• Automated follow-up sequences.

#10: Wonderwork

Rolling out HubSpot in clearly defined phases is how wonderwork, a London digital marketing agency, approaches CRM implementation for B2B and challenger brands.

The wonderwork process moves from account setup and data imports into lead scoring and nurture workflows, and the agency publishes starting prices for its HubSpot onboarding packages.

Services

• HubSpot setup, data imports and integrations.
• Buyer personas, forms, custom properties and lead scoring.
• Lifecycle stage definitions and nurture workflows.
• Workflow automation and smart content.
• Performance monitoring and reporting.
• Content and copywriting support for nurture campaigns.

How do you choose the right CRM agency in the UK?

The right CRM agency is the one whose specialism matches the CRM problem the business actually has, whether that is lifecycle revenue from existing customers or a sales system the team will use every day.

Working through the six checks below, in order, narrows most shortlists to two or three serious candidates.

1. Name the type of CRM work first: Brands chasing repeat purchases from existing customers need a lifecycle marketing agency. Companies tracking leads and deals through a pipeline usually need a CRM implementation partner for HubSpot or Salesforce.
2. Check platform depth against the current stack: An agency with senior experience on the platform already in place will move faster than one still learning it. A platform-agnostic agency is more useful when a migration is still being considered.
3. Ask for an audit before agreeing a retainer: A good CRM audit benchmarks performance against comparable brands and ranks each fix by expected revenue. Starting with one gives both sides an honest baseline before any long-term commitment.
4. Confirm the engagement model: Some businesses want embedded specialists, and others want a dedicated account team or support on a single project. Asking for the names and roles of the people on the account avoids surprises after signing.
5. Agree how success will be measured: Lifecycle CRM is normally judged on repeat purchase rate and revenue per customer. For a sales CRM rollout, adoption by the team and the quality of pipeline reporting tell you more.
6. Check how the agency handles customer data: UK GDPR and PECR set the rules on consent and marketing messages, and both need careful handling during any data migration. Agencies working with UK lists every day should be able to describe their consent and migration process in detail.

What services do CRM agencies in the UK offer?

CRM agencies in the UK offer two broad groups of services: lifecycle marketing that grows revenue from existing customers, and CRM systems work that keeps customer data clean and connected.

Some agencies on this list cover both groups, though most lean clearly towards one.

Lifecycle marketing services usually include:

• CRM audits that benchmark current performance and produce a prioritised roadmap.
• Customer journey mapping across the full lifecycle, from first visit to winback.
• Automated flows such as welcome, abandoned cart, post-purchase and re-engagement journeys.
• Campaign planning, copywriting and email design for launches and trading peaks.
• Segmentation and personalisation based on behavioural and purchase data.
• SMS, push, WhatsApp and loyalty programmes coordinated with email.
• Deliverability management, list hygiene and split testing.

CRM systems services usually include:

• Platform selection, onboarding and migration between CRM or ESP tools.
• Integration with ecommerce platforms, ad accounts, analytics and reporting tools.
• Data warehousing, data quality checks and GDPR-compliant data handling.
• Lead scoring, pipeline setup and sales automation in tools like HubSpot or Salesforce.
• Team training so in-house staff can run the system confidently.

Work with Underground Ecom on your CRM

For many ecommerce brands, a large share of first-time buyers never place a second order, even though every one of those customers was paid for through ad spend.

Switching CRM agencies every year and rebuilding flows from scratch each time makes that problem worse, because each reset throws away months of data and testing.

We built Underground Ecom to stop that cycle, with a full retention team and senior strategists on every account, plus Underground Insights benchmarks from 500 DTC brands showing exactly where your customers are slipping away.

A CRM Audit & Roadmap with our team pinpoints the flows leaking repeat revenue within two to three weeks, ranking every fix by revenue impact so your team knows where to start.

Frequently asked questions

What is the best CRM agency in the UK for ecommerce brands?

Underground Ecom is the best CRM agency in the UK for ecommerce brands, because its whole service is built around customer retention on Klaviyo.

Every client gets a dedicated team led by a CRM Director, and Underground Insights benchmarks each programme against 500 DTC brands.

What is the best CRM agency in the UK for Klaviyo users?

For brands already on Klaviyo, Underground Ecom is the strongest choice, holding Klaviyo Master Elite Partner status and a place among Klaviyo’s Agency Partners of the Year for EMEA in 2025.

Strategy Director Stefan has generated over $200m in revenue through Klaviyo, and that senior platform expertise is built into each account through our agency’s strategy layer.

What is the best CRM agency in the UK for subscription brands?

Subscription brands are best served by Underground Ecom, given our work with AG1, where a rebuilt flow ecosystem lifted flow revenue by 18% and added 75,000 new subscribers in 2025.

Underground Insights also groups customers into cohorts, showing subscription brands which customers are most likely to buy again.

What is the best CRM agency in the UK for Black Friday and peak trading?

Underground Ecom is the best fit for brands planning around Black Friday, based on its work with Huda Beauty during BFCM 2024.

An audit ahead of the peak, followed by strategy support, delivered over £10m in Klaviyo revenue and a 673% year-on-year uplift for Huda Beauty.

What is the best CRM agency in the UK for a CRM audit?

The most practical CRM audit for ecommerce brands comes from Underground Ecom, whose CRM Audit & Roadmap ranks every recommendation by revenue impact.

The audit takes two to three weeks and is never tied to a retainer, so brands can act on the roadmap in-house if they prefer.

What is the best CRM agency in the UK for B2B companies using HubSpot?

Catalyst Marketing Agency is the best option for B2B companies and SMEs that need HubSpot set up and adopted across their sales teams.

The agency holds HubSpot Diamond Partner status and builds team training into each project.

Although for a phased HubSpot rollout with published starting prices, I’d argue wonderwork is a strong alternative.

What it’s Like to work with Underground Ecom?

Want to work with our team?