London (WC1), with a remote team working GMT hours
Best for: Premium DTC brands that want a specialist to run Klaviyo email, SMS and lifecycle retention
A retention marketing agency for DTC brands that runs CRM audits, lifecycle flows, email, SMS and RCS, loyalty, subscription and referral journeys, and performance analysis. It names REFY, Daniel Wellington, Grown Alchemist and Real Science Athletics among its clients.
- Its website gives a London WC1 contact location, describes it as a Klaviyo Platinum Master Partner for premium DTC brands, and names REFY, Daniel Wellington and Grown Alchemist among its clients.[7]
- Klaviyo's own partner directory lists Melusine Studio at the Platinum Master tier, with case studies for REFY, Grown Alchemist and Daniel Wellington and a testimonial from REFY's Senior CRM/CX Manager.[8]
London, with teams in Dubai and Auckland
Best for: DTC brands that want paid acquisition, retention, creative and measurement run as one programme and judged on contribution margin, payback and LTV
A growth marketing agency founded in 2022 with a team in London. For DTC brands it audits CAC by channel, margin by product, repeat purchase and attribution quality before scaling spend, then runs paid acquisition, lifecycle email and SMS, performance creative and measurement as one revenue engine.
- MxD Digital was founded in 2022 and has teams in London, Dubai and Auckland.[1][5]
- Its DTC page covers paid acquisition on Meta, Google, TikTok and Amazon, retention and lifecycle flows including SMS, performance creative, and measurement that connects ecommerce, ad, analytics and lifecycle data, with spend judged on acquisition cost, contribution margin, payback and customer quality.[2]
- It reports ROAS, contribution margin, blended CAC, payback and LTV together, uses cohort and repeat-purchase curves, and runs holdouts and incrementality tests where useful.[2]
- For paid media, platform-attributed ROAS is reconciled against CRM conversions, booked revenue and actual commercial outcomes, and lifecycle journeys are tested by cohort with holdouts where practical.[3][4]
London, with offices in Manchester and New York
Best for: Shopify brands that need a store build or migration plus ongoing CRO, A/B testing and Klaviyo email
A London Shopify agency established in 2018 that designs, builds and migrates Shopify and Shopify Plus stores and runs conversion rate optimisation, A/B testing, SEO and email, SMS and Klaviyo work. It names Cambridge Satchel, Candy Kittens, Billionaire Boys Club and Muc-Off among its clients.
- Shopify's partner directory lists Charle Agency as a Premier Partner with London as its primary location, serving clothing and fashion, food and drink, health and beauty, and home and garden brands, with featured CRO work for Candy Kittens and Billionaire Boys Club.[10]
- Its own site says it is based in London, was established in 2018 and holds Shopify Plus accreditation, and lists CRO, A/B testing and email, SMS and Klaviyo services.[9][22]
London (Clutch lists London as its headquarters and only location)
Best for: Ecommerce and DTC brands that want paid social on Meta and TikTok, with creative production, run by one team
A full-funnel performance agency (trading name of Indigital XYZ) that runs paid social on Meta, TikTok, Pinterest and Snapchat, Google Ads, creative production, email and CRM, app marketing and influencer work. It names Oddbox, Elvie, Teapigs, Elephant Box and Durex among its clients.
- Clutch lists a 4.6 rating from 39 reviews, London as headquarters, a 2017 founding date and eCommerce as its largest industry focus at 20%. Verified reviews include the co-founder of D2C reusables brand Elephant Box reporting revenue up about 80% over five months against the prior year; reviews are mixed, including a 0.5 rating from a mobile app client that saw no rise in installs.[12]
- Its website shows Meta, TikTok and Google partner badges and reports, as its own results, £500K in sales and a 25% ROAS increase from TikTok campaigns for Durex UK and 49% more sales from Meta ads for Teapigs.[11]
London (primary location in Klaviyo's partner directory)
Best for: Shopify DTC brands that want a small specialist team to run Klaviyo email and SMS retention
A retention marketing agency for DTC brands covering email and SMS strategy, automation, segmentation, design and copywriting on Klaviyo and Shopify. It names SURREAL, Magic Mind, Days Brewing, PÄRLA and HUX among its clients.
- Klaviyo's partner directory lists ElliotDigital at the Platinum Master tier with London as its primary location, Shopify and Shopify Plus expertise, and a testimonial from the co-founder of SURREAL.[13]
- Its website describes a full-stack retention team for DTC brands, names SURREAL, Magic Mind, Days Brewing and HUX among its clients, and quotes a HUX co-founder saying the agency helped it achieve 50% of revenue through Klaviyo.[14]
London (EC2) headquarters, with an office in Dubai
Best for: Online retailers whose next gain is organic search, technical fixes and conversion rate work rather than paid social
A search-led agency founded in 2008. Its Clutch profile puts 80% of its service focus on SEO, with ecommerce marketing and PPC making up the rest; ecommerce is 15% of its industry focus, behind gambling at 40%.
- Clutch lists a 5.0 rating from 19 reviews and London as headquarters. Verified 2026 reviews include online retailer Bossy Cat reporting a 40% conversion rate increase after CRO, UX and a site relaunch, and an ecommerce company reporting organic revenue up 61.7% (from £75,092 to £121,406).[23]