When should ecommerce teams stop prioritising marginal CRO gains?
Ecommerce teams should stop prioritising marginal Conversion Rate Optimisation (CRO) gains when their core conversion experience is already functionally complete. For most established retailers, further A/B testing of button colours yields diminishing returns. The real growth bottleneck is now more likely to be found in how customers discover you (Discovery), why they should choose you (Proposition), or why they should return (Retention). It becomes a question of where your next 10% of growth will come from.
The benchmark: 92.6/100 for Conversion Experience
Our research across 75 leading UK home and interiors retailers found an average Conversion Experience score of 92.6 out of 100. This score measures the functional quality and completeness of the path to purchase, from product page to payment confirmation. It assesses capability, not the conversion rate itself.
92.6 / 100
Average Conversion Experience Score
Source: The UK Home & Interiors Digital Growth Benchmark 2026, n=75 UK retailers.
The data shows a market that has converged on a very high standard. The median score is even higher at 94.1, and leaders like IKEA and John Lewis are near-perfect. Even the lowest score in our cohort was 69.1. In simple terms, most major online retailers have already built a slick, trustworthy checkout process. It is no longer a source of competitive advantage; it is operational hygiene.
How we calculate this benchmark
This number comes from our proprietary research study, The UK Home & Interiors Digital Growth Benchmark 2026. We conducted an outside-in analysis of 75 UK retailers, scoring each against 54 criteria. These criteria are grouped into six pillars that define a company's growth potential. The Conversion Experience pillar specifically examines the quality of the product detail page, basket, checkout flow, payment options, and on-site trust signals. You can read the full details of our scoring in our methodology section.
Where does your business sit?
Knowing the average is one thing; knowing where you stand is another. We group performance into three bands. If you are a £5m-£50m business, comparing your checkout's functionality against this table will give you a clear indication of where to focus your resources.
| Band | Conversion Experience Score | What this means for you |
|---|---|---|
| Healthy | 90+ | Your path to purchase is functionally complete and likely frictionless. It is not the bottleneck in your growth. Further investment here will yield marginal gains. Reallocate your resources to a bigger problem. |
| Watch | 80 - 89 | You have one or two meaningful functional gaps. This might be a lack of key payment options or no guest checkout. These are worth fixing, but they are discrete projects, not a reason for a perpetual CRO programme. |
| Broken | Below 80 | Your checkout process has serious functional flaws that are actively losing you sales every day. This is a commercial fire. Fixing your core conversion journey should be your number one priority. |
Three reasons your conversion experience score is low
In our consulting work with retailers who score in the 'Watch' or 'Broken' bands, the causes are rarely subtle. They are almost always one of three fundamental issues:
- Outdated Platform Technology: The site runs on a legacy or overly-customised platform that makes modern checkout features difficult to implement. Symptoms include multi-page checkout forms, no address auto-complete, and a mandatory account creation step. This isn't a UX issue; it's an infrastructure problem.
- A Scarcity of Payment Options: The business has failed to keep pace with customer expectations. In 2024, not offering Apple Pay, Google Pay, and relevant Buy Now Pay Later options is a direct barrier to purchase, especially on mobile devices where they eliminate form-filling.
- Weak Reassurance Signals: For high-consideration items, customers need to feel confident. If clear information on delivery costs, returns policies, and security is missing from the basket and checkout pages, shoppers will hesitate. Last-minute doubt is a conversion killer. We've written about what trust signals actually drive sales.
What to fix first (and how long it takes)
If you are below the 'Healthy' band, the fastest, highest-impact change is to expand your payment options. This is often a self-contained technical project that doesn't require a full site redesign. Implementing a wallet payment like Apple Pay or a key BNPL provider can be done in as little as two to four weeks.
The results show quickly. You should see a measurable improvement in your mobile conversion rate and a reduction in checkout abandonment within the first full month of data after launch.
Your real growth bottleneck is probably not conversion
If your conversion experience is already strong, spending more time and money on it is a classic case of diminishing returns. The data from our benchmark study shows where the real opportunities lie.
While Conversion Experience scores an average of 92.6, Retention & CRM scores just 71.2, and AI Discovery is a stark 40.1. The gap between 'best' and 'worst' performance is vast in these areas, unlike in conversion.
This tells us that for most established retailers, the growth constraints have moved. The bottleneck isn't the final step of the journey; it's much earlier. The biggest ecommerce growth strategy questions are now:
- Discovery: How do we help customers find the right products from our large catalogue, especially when they don't know exactly what they're looking for?
- Retention: How do we earn a second purchase from a customer who has already bought from us once?
Spending £50,000 to improve your AI-powered product discovery from a score of 40 to 60 will generate a far greater commercial return than spending it to lift your conversion experience from 93 to 94. Good ecommerce has become table stakes, as we argue in our piece on why 'good' is no longer enough. The next step is to perform a clear-eyed assessment of where your business is genuinely weakest and re-direct your resources there. A balanced Growth Diagnostic can show you where to look.