Retention Marketing Agency | London

Retention Marketing Agency for Ecommerce Brands

Sabre Digital is a London-based retention marketing agency helping Shopify brands increase repeat purchases through Klaviyo email flows, SMS campaigns and lifecycle marketing systems.

Over £7.2M in managed ad spend supported by lifecycle marketing and retention systems. Brands we work with see significant increases in repeat purchase rates and customer lifetime value when retention is structured correctly.

Sabre Digital is a London-based retention marketing agency helping ecommerce brands generate predictable repeat revenue. We design and optimise Klaviyo flows, campaign calendars and lifecycle automation that turn one-time customers into long-term buyers.

Sabre Digital is a London-based ecommerce marketing agency helping Shopify brands scale through retention marketing, Klaviyo email automation and lifecycle marketing strategies.

Klaviyo retention marketing dashboard showing email revenue and lifecycle flows
£7.2MAd Spend Managed
100+Brands Scaled
94%Client Retention
The retention problem

Why Most Ecommerce Brands Underperform on Retention.

Most ecommerce brands focus heavily on customer acquisition but neglect retention marketing. Without structured lifecycle campaigns, brands lose significant revenue after the first purchase.

  • No structured email flow system
  • Weak abandoned cart recovery
  • Inconsistent email campaigns
  • Low repeat purchase rates
  • Poor segmentation and targeting
  • No SMS lifecycle strategy

Retention marketing solves this by building automated systems that drive repeat purchases and increase customer lifetime value without increasing ad spend.

Ecommerce lifecycle marketing flow from welcome to winback
Revenue impact

The Revenue Impact of Retention Marketing.

Retention improvements dramatically increase profitability without increasing ad spend. Improving repeat purchase rates has a compounding effect on revenue over time.

Retention marketing is one of the highest-ROI channels available to ecommerce brands.

Retention revenue growth chart showing repeat purchase rate increasing
Example: Retention Revenue Impact
Before Retention System
Customers1,000
Repeat Purchase Rate20%
Orders1,200
Revenue£96,000
After Retention System
Customers1,000Same customers
Repeat Purchase Rate35%+75%
Orders1,350+150 orders
Revenue£108,000+£12k/month

Retention improvements alone can add significant revenue without acquiring a single new customer.

Our retention system

The Sabre Retention Marketing System.

Sabre builds structured lifecycle marketing systems that continuously generate repeat revenue for ecommerce brands across London, the UK, Europe and the United States.

Our system maps the full customer journey, architects automated Klaviyo flows at every touchpoint, develops campaign calendars aligned with your business, and continuously optimises performance through testing.

Klaviyo lifecycle flow architecture from welcome to winback
Stage 01

Lifecycle Mapping

Map the full customer journey including welcome, abandoned cart, post purchase, replenishment and winback touchpoints.

Stage 02

Flow Architecture

Design automated Klaviyo flows that drive conversions at each lifecycle stage with targeted messaging.

Stage 03

Campaign Calendar

Develop campaign calendars aligned with product launches, promotions and seasonal demand cycles.

Stage 04

Optimisation

Test subject lines, creative, offers and segmentation to continuously increase open rates and revenue.

What we deliver

Retention Marketing Deliverables.

Sabre produces a full range of retention marketing deliverables for ecommerce brands, all built inside Klaviyo and integrated with your Shopify store.

Every flow, campaign and segment is designed around one goal: increasing the revenue generated from your existing customer base.

Klaviyo email campaign dashboard showing open rates and revenue
Klaviyo Email Flows

Automated flows designed to convert customers at each stage of the lifecycle.

WelcomeAbandoned CartPost PurchaseWinback
SMS Marketing

SMS campaigns designed to complement email and drive immediate conversions.

Checkout SMSFlash SalesProduct LaunchesRestock
Campaign Management

Ongoing email campaign strategy aligned with promotions and launches.

PlanningCopywritingDesignSegmentation
Segmentation

Customer segmentation based on behaviour, purchase history and engagement levels.

BehaviouralPurchase HistoryEngagementRFM
Is Sabre right for you

Who Retention Marketing With Sabre Is For.

Sabre works with ecommerce brands at any stage that are ready to build structured retention systems and increase repeat revenue.

Good Fit
  • You run or are launching a Shopify ecommerce brand
  • Established brand or new brand building retention from launch
  • Growing paid acquisition and need to retain customers
  • Looking to increase repeat purchase rate and LTV
  • Looking for a long-term growth partner
Not A Good Fit
  • No product, no budget and no plan
  • Not prepared to invest in lifecycle marketing
  • No customer data or email list to work with
  • Looking for low-cost freelance work
What Happens Next
  • 01 Full retention and lifecycle audit
  • 02 Klaviyo flow architecture designed
  • 03 Campaign calendar launched
  • 04 Ongoing optimisation and testing
Book a Growth Strategy Call
Proof is in the numbers

Retention Marketing Results.

Eirlys Studio retention marketing case study showing revenue growth
Eirlys Studio, Premium Welsh Chopping Boards

Retention marketing integrated with paid social to scale to £200k+ per month.

Sabre built Klaviyo lifecycle flows alongside paid social campaigns for Eirlys Studio. Welcome flows, post-purchase sequences, replenishment reminders and winback campaigns all contributed to increasing repeat purchase rates and customer lifetime value.

Klaviyo FlowsWelcome SeriesPost PurchaseWinbackSMS MarketingCampaign Calendar
View All Case Studies
Common questions

Retention Marketing FAQ.

Retention marketing focuses on increasing revenue from existing customers through lifecycle email flows, SMS campaigns and personalised messaging. For ecommerce brands this typically includes Klaviyo automation, segmentation and campaign management.
Essential flows include welcome series, abandoned cart recovery, browse abandonment, post-purchase upsells, replenishment reminders and winback campaigns. These flows ensure customers continue purchasing after their first order.
Klaviyo is the most widely used lifecycle marketing platform for ecommerce brands because it integrates deeply with Shopify and allows advanced segmentation, automation and revenue tracking. Sabre is a certified Klaviyo Partner.
For most ecommerce brands, retention channels such as email and SMS generate 20-40% of total store revenue once lifecycle flows and campaigns are optimised. Brands that treat retention as a system rather than an afterthought consistently outperform.
Most brands begin seeing improvements within 30-60 days after implementing structured flows and campaigns. Revenue continues to increase as segmentation and optimisation improve over time.
Yes. Sabre works with brands at any stage. For new brands, building retention foundations from launch means every customer acquired through paid social or paid search enters a structured lifecycle system from day one. This maximises the return on every acquisition pound spent.
Paid acquisition drives new customers. Retention marketing turns those customers into repeat buyers. Together they create a compounding growth system where acquisition costs are offset by higher lifetime value. Sabre integrates both so your paid and retention channels work as a single system.
Why brands choose Sabre

A retention agency that prioritises revenue.

Sabre Digital is a certified Klaviyo Partner based in London. Every flow and campaign we build is designed around one goal, turning existing customers into repeat buyers.

Unlike agencies that focus on open rates and vanity metrics, Sabre measures retention by the revenue it generates. You work directly with Harry from day one.

£7.2MAd Spend Managed
100+Brands Scaled
94%Client Retention
  • Certified Klaviyo Partner
  • Lifecycle flows for every customer touchpoint
  • Revenue-focused, not vanity metrics
  • Direct access to Harry from day one
  • 94% client retention over 4 years
Sabre Digital certified Klaviyo Partner London Sabre Digital certified Shopify Partner Sabre Digital 5 star Google Reviews Sabre Digital 5 star Trustpilot reviews
Ready to increase repeat revenue?

Ready to Increase Repeat Revenue?

In a free 30-minute strategy call Harry will review your retention marketing system and identify opportunities to increase repeat purchases and customer lifetime value.

Book a free retention audit

30 minutes with Harry. No pitch, just honest insights for your brand.

  • Review your current Klaviyo flows and campaigns
  • Identify gaps in your lifecycle marketing
  • Outline a retention strategy to increase repeat revenue
  • Highlight quick wins for immediate improvement
Book a Growth Strategy Call

We only take on 2-3 new brands per month to ensure hands-on strategy.

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