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CRO Agency UK: The Questions to Ask Before You Hire One, and How We Answer Them
Most UK businesses arrive at this page comparing conversion rate optimisation agencies, so it is built as the comparison: six questions that separate research-led CRO from a best-practice checklist, our answers beside the usual ones, and how website CRO programmes and landing-page sprints are priced in GBP. Pick your starting point below; the free conversion review shows the three biggest leaks and their monthly cost.
Key facts before you compare CRO agencies
| Question | Answer |
|---|---|
| What CRO covers here | Analytics and consent audit, behavioural research (recordings, heatmaps, form analytics), a scored backlog, A/B or sequential tests where traffic allows and direct fixes where it does not, with monthly reporting in enquiries, orders and revenue per visit |
| Two services | Website CRO for funnels that span many pages and landing page CRO for the handful of pages a campaign depends on; the situation table below says which to start with |
| How it is priced | Quoted per programme or per landing-page set after a free conversion review; CRO also runs inside managed SEO from £2,000 per month, month to month, so one plan covers rankings and conversion |
| Lowest commitment | The conversion review is free and carries no obligation; programmes are month to month and sprints fixed-scope |
| How long until results | Consent and tracking fixes plus quick wins ship inside two weeks; a tested result on a mid-traffic UK site takes 6–8 weeks per round; lower-traffic sites change sooner because fixes ship directly |
| Where and how we work | Clients in London, Manchester, Birmingham, Leeds, Bristol and Edinburgh and across the UK; research read-outs, test reviews and reporting calls run online in GMT/BST business hours |
| What we do not do | Sell a fixed number of tests per month without a traffic figure, declare winners from two weeks of data, build variants that breach ASA or CMA rules on pricing and reviews, or promise uplift percentages |
| How we decide | Data-driven: every recommendation starts from your Search Console, analytics and competitor data, and every month is reported in enquiries, calls, forms and sales, not rankings alone |
| Reviewed | 26 October 2026 by Ren Hao, Founder & Lead SEO Strategist; service scopes and pricing basis checked against the current rate card and the UK SEO pricing guide |
Which CRO service fits your situation
Start from where the revenue leaks, not from the agency pitch. Each row names the service that fixes that first; the service pages hold the method, examples and FAQs.
| Your situation | Start with | Why this first | What the free review shows |
|---|---|---|---|
| Service firm ranking well in London or your region, enquiries flat | Website CRO UK | When the funnel spans service, location and contact pages the leak is usually earlier than the form; a full-funnel audit finds it before anything is tested | Drop-off by page and device, the three biggest leaks and their monthly cost in GBP |
| Google Ads or organic traffic landing on a few campaign pages | Landing page CRO UK | A small page set with concentrated traffic reaches test significance fastest, so this is where testing pays back first | Page-level conversion rate against UK sector benchmarks, first hypotheses |
| Online store with traffic but weak basket and checkout rates | eCommerce SEO UK (store growth programme) | Store conversion depends on category and product pages as much as checkout; CRO runs inside the store programme so merchandising, delivery options and SEO are tested together | Funnel from category to purchase by device, delivery and payment friction, speed baseline |
| Site converts, but there is not enough traffic to test anything | SEO services UK | Below roughly 2,000 sessions a month, growth comes from ranking first; conversion fixes ship directly from research and testing starts once traffic supports it | Traffic required per test, demand you are not yet capturing, the order to do things in |
| Cookie banner blocks half the data and the pages are slow on mobile | Technical SEO UK | Consent configuration and Core Web Vitals are prerequisites: you cannot test what you cannot measure, and a slow page measures patience rather than persuasion | Consent-mode data loss, Core Web Vitals on UK mobile networks, what to fix before testing |
| The site is dated and every change waits on a developer | Conversion web design UK | Optimising around a rigid build wastes months; a conversion-focused rebuild from £1,000 one-off is often the faster route | Whether to rebuild or optimise, with the evidence either way |
| You are comparing agencies and want to know what to ask | The six questions in the comparison table below | The answers tell you within one call whether an agency does research or recites a checklist | Our answers, with the free review as the evidence |
CRO services in the UK
Two services, each with its own method, examples and FAQs. Both start with an analytics and consent audit and report results as enquiries, orders and revenue per visit in GBP.
Scope and timeline by CRO service
The only table on this page that lists every service side by side. Compare scope and timeline here; the pricing basis is in the table further down.
| Service | Best for | What is delivered first | Typical timeline |
|---|---|---|---|
| Free conversion review | Any UK site with analytics in place | Consent and tracking check, funnel drop-off by page and device, three biggest leaks with their monthly cost | 3 working days |
| Website CRO programme | Funnels spanning service, location, category, product and contact pages | Full research round, scored backlog, quick wins shipped | Research weeks 1–2; first tested result weeks 6–8; month to month |
| Landing page CRO sprint | A small set of campaign pages carrying concentrated traffic | Page-level diagnosis, first hypotheses, variants built and QA’d | Fixed 6–8 week sprint |
| CRO inside managed SEO | Sites where rankings and conversion both need work | One audit covering the keyword map and the conversion backlog | Month to month, from month one |
| Conversion-focused rebuild | Sites too slow or rigid to test on | Architecture and templates built around each page’s primary action | 10 working days to 5 weeks, by page count |
| Consent and tracking audit only | Teams who will do the fixes themselves | GA4 event audit, consent-mode review, call and form tracking checks with test submissions | 1 week |
Six questions to ask any UK CRO agency, with the answers to expect
These are the questions that separate research-led conversion rate optimisation from a checklist with a retainer attached. Our answers are in the last column so you can hold us to them. Pricing is in the table after the checklist.
| Question | Why it matters | Common answer | Our answer |
|---|---|---|---|
| How much traffic do our pages need before you would run an A/B test? | Many UK sites, including well-ranked regional ones, cannot reach significance on a split test | A number of tests per month, no traffic figure | Stated per page: under ~2,000 sessions a month we ship direct fixes; 2,000–10,000 sequential tests; above that A/B tests to 95% confidence |
| Where do your hypotheses come from? | Hypotheses from a checklist produce the same tests on every site | Best-practice review by a senior consultant | Recordings, heatmaps, form analytics and your sales-call feedback on the revenue pages, scored on impact, evidence and effort |
| Who implements the winners? | Decks of recommendations die in the backlog of an in-house developer | Recommendations handed to your team | We build, QA and ship winners permanently into the site, and check crawl, speed and ranking impact first |
| How do you handle consent and data? | UK GDPR and PECR consent choices can remove half the data a test relies on | Rarely addressed | Consent-mode audit first, recording tools configured to exclude form fields and personal data, access via a dedicated account removed at the end |
| What do you report? | “Tests run” is activity; enquiries and revenue per visit are results | Tests run, uplift percentages | Conversion rate by page and device, enquiries or orders, revenue or pipeline per visit in GBP, and what each shipped change taught |
| What are the contract terms? | Twelve-month CRO retainers lock you in before the first result | Six or twelve months minimum | Month to month for programmes, fixed scope for sprints, the free review carries no obligation |
What every CRO engagement includes
- ✓Analytics and consent auditGA4 events, Tag Manager, consent-mode configuration under UK GDPR and PECR, and form and phone-call tracking verified with real test submissions before any recommendation.
- ✓Behavioural research on revenue pagesSession recordings, heatmaps, scroll maps, form analytics and short on-site surveys on the pages that carry enquiries or sales, segmented by device.
- ✓Funnel diagnostics by device and sourceDrop-off mapped page by page from landing to enquiry or purchase, with each leak costed in GBP so the backlog is ordered by money, not opinion.
- ✓Scored hypothesis backlogEvery observed problem becomes a hypothesis scored on expected impact, strength of evidence and effort; clear defects ship immediately, the rest enter the test or fix queue matched to your traffic level.
- ✓Test design, build and QAVariants designed and written, built without slowing the page or breaking tracking, QA’d across devices, and checked for crawl and ranking impact before going live.
- ✓Copy, proof and trust elementsValue proposition, pricing clarity, proof placement, delivery and returns information and the trust signals UK buyers look for, written and designed rather than listed.
- ✓Advertising-rule check on variantsHeadline prices, comparison claims and review displays checked against ASA/CAP Code and CMA guidance before a variant is built.
- ✓Monthly reporting in plain numbersConversion rate by page and device, enquiries or orders, revenue or pipeline per visit and the tests shipped, in GBP; CRO can also run inside managed SEO in the UK as one plan.
How CRO is priced in the UK
CRO is quoted per programme or per landing-page set because research depth, page count and traffic level drive the work more than any package. The table shows the basis for each scope; retainer ranges come from our UK SEO pricing guide. All figures are in GBP and fixed in writing before work starts.
| Scope | How it is priced | Ren Hao SEO |
|---|---|---|
| Conversion review | Free from most agencies, with varying depth | Free; consent and tracking check, funnel drop-off and three costed leaks, written up in 3 working days |
| Website CRO programme | Monthly retainer; UK agencies quote widely and often on 6–12 month terms | Quoted per programme after the free review, month to month, scope fixed in writing |
| Landing page CRO sprint | Per page set or per test | Fixed quote per sprint after the review; variants, build and QA included |
| CRO inside managed SEO | UK SEO retainers commonly run £1,500–£5,000 per month | From £2,000 per month, month to month, with the conversion backlog in the same plan |
| Conversion-focused rebuild | Per project | From £1,000 one-off through our web development service; maintenance not included |
| Testing and analytics tools | Often resold at a margin or locked to the agency | Built on your GA4, Tag Manager and a free session-recording tool; any paid testing platform licensed in your name |
| Consent and tracking audit only | Often bundled and unpriced | Fixed quote, credited against a programme if you proceed within 60 days |
A UK CRO proposal with a twelve-month term and a monthly test count, but no traffic figure and no consent audit, is priced for the agency’s stability rather than your result. Run the six questions above before comparing prices.
How a CRO engagement runs
- 1Consent, tracking and funnel map (weeks 1–2)We audit GA4, consent mode and call and form tracking with real submissions, map the funnel by page, device and source, and cost each leak in GBP; quick wins for clear defects ship in this window.
- 2Research and scored backlog (weeks 2–3)Recordings, heatmaps, form analytics and your sales-call feedback explain why visitors leave; every finding becomes a scored hypothesis and each page is matched to the method its traffic supports.
- 3Tests and fixes (weeks 3–8)A/B or sequential tests where traffic allows, direct fixes where it does not; variants are built, QA’d, checked against advertising rules and verified for speed and crawl impact before going live.
- 4Ship, document, repeat (monthly)Winners made permanent, losers documented, the backlog re-scored and the next round planned; the monthly report shows conversion rate, enquiries or orders and revenue per visit in GBP.
Comparing CRO agencies this month?
Send us your site and analytics access. We run the consent and tracking check, find the three biggest leaks and tell you what each costs per month, free, so you have a benchmark for every other proposal.
Documented result from the same process
The example below is a regulated financial services brand whose enquiries grew 5× as high-intent terms reached page one, through the same research-first process combined with SEO; the client’s name is withheld under NDA and the figures come from their analytics.
- 5×Organic enquiries
- Page 1High-intent terms
- 6 monthsTime to that result
- Financial servicesRegulated, trust-dependent category
How delivery is set up for UK clients
- ✓UK GDPR and PECR consentConsent choices are honoured in the tagging, recording and heatmap tools exclude form fields and personal data, and analytics access runs through a dedicated account removed at the end.
- ✓ASA, CAP Code and CMA rules on variantsHeadline prices shown with all mandatory charges, comparison claims substantiated, and reviews displayed as collected under the fake-reviews provisions; a variant that would breach them is not built.
- ✓Mobile and UK networksResearch and tests are segmented for mobile, and variants are checked against Core Web Vitals on UK 4G and 5G connections rather than a lab score.
- ✓Delivery and returns signalsStore tests cover what UK shoppers check before buying: delivery times and costs, returns under the Consumer Contracts Regulations, payment options and a visible UK contact.
- ✓Online working in GMT/BSTResearch read-outs, test reviews and reporting calls run on video calls in UK business hours, with a named strategist from our Johor Bahru headquarters.
- ✓No ranking or conversion guaranteesYou get the six-question comparison, realistic ranges and month-to-month terms; promised uplift percentages would not survive your own analytics.
- ✓SEO-safe changesEvery variant is checked for crawlability, speed and ranking impact before it goes live, because a conversion win that costs a page its ranking is a loss.
- ✓GBP invoicing and reportingProgrammes and sprints invoiced in GBP, purchase orders supported, reporting tied to your CRM or store data and aligned to your financial year.
“Ren Hao SEO turned organic search into our biggest pipeline source. We finally have a channel that compounds.”
“The transparency is unlike any agency we’ve worked with. We always know what’s happening and why.”
Frequently asked questions
How do I choose a conversion rate optimisation agency in the UK?
Ask the six questions in the table on this page: the traffic threshold for a split test, where hypotheses come from, who implements winners, how consent and data are handled, what is reported, and the contract terms. An agency that answers with a monthly test count, a best-practice review and a twelve-month term is selling activity; one that answers with traffic figures, research sources and month-to-month terms is selling results.
How much traffic do I need for CRO to work?
Less than most agencies imply, if the method matches the traffic. Below roughly 2,000 sessions a month on the pages in scope, fixes ship directly from research; between 2,000 and 10,000 we run sequential tests one page at a time; above 10,000, A/B tests reach significance within a normal month. Many well-ranked regional UK sites sit in the first two bands.
How much do CRO services cost in the UK?
Programmes and landing-page sprints are quoted after the free conversion review, because research depth, page count and traffic level drive the work; the scope and price are fixed in GBP in writing. If rankings also need work, CRO runs inside managed SEO from £2,000 per month, month to month, so one plan covers both.
Do you work with London businesses only?
No. Clients are in London, Manchester, Birmingham, Leeds, Bristol, Edinburgh and smaller towns; every engagement runs online in UK business hours, and the research is on your visitors rather than your postcode.
How do UK GDPR and cookie consent affect CRO?
Significantly: consent choices can remove a large share of the data a test relies on, and recording tools must be configured so they do not capture personal data. We audit consent mode first, configure recording and heatmap tools to exclude form fields, honour consent in the tagging, and state the data coverage with every result.
Does CRO affect our SEO?
It can, in both directions. Changes that slow a page, hide content or alter URLs can cost rankings, so every variant is checked for crawl, speed and ranking impact before going live. Done properly, the pages that convert better also earn more engagement, links and repeat visits.
How long before we see results?
Consent and tracking fixes and clear defects are corrected in the first two weeks, and lower-traffic sites usually see a measurable change inside a month because fixes ship directly. A tested, confidence-stated result on a mid-traffic site takes 6–8 weeks per round; what you should not expect is a winner declared from two weeks of thin data.
About this page
Written by the Ren Hao SEO team and reviewed by Ren Hao, Founder & Lead SEO Strategist (LinkedIn). Ren Hao SEO is a data-driven international SEO agency headquartered in Johor Bahru, Malaysia, serving eight country markets including the United Kingdom (company LinkedIn). Retainer ranges come from our current rate card and the local SEO pricing guide; the case result is documented in the linked case study. Drafting is assisted by AI tools and every page is edited and fact-checked by our team before publication; see how we create our content. For the rankings side, see SEO services UK; for city-level pages, see SEO services by UK city.
Get a free conversion review: consent and tracking checked, the three biggest leaks found and costed in GBP.