Greater London is the largest, most competitive accountancy market in the UK – five times bigger than Birmingham or Manchester. But when an SME founder asks ChatGPT, Perplexity, Claude or Google AI to recommend an accountant in London, the system can only suggest firms it can read. We measured how readable 150+ London practices are across 250+ signals. This is what we found.
The leaderboard alone tells a partial story. The interesting data is in what almost every firm in Greater London is doing – or, more precisely, not doing.
A byline says "John Smith, Partner." A human reader knows who wrote what. But AI engines reading the same page can't tell if John is a senior chartered accountant, a junior writer, or a client quoted in a testimonial – because there's no Author Person schema attached to make those credentials machine-readable. 123 Greater London firms display partner names. AI doesn't know who any of them are.
The same pattern appears across all three UK cities we've benchmarked. Of 351 accountancy firms across Birmingham, Manchester and Greater London, just 18 have properly-labelled author biographies. This isn't a London problem. It's a UK accountancy industry pattern at its most extreme.
Greater London is roughly five times larger than Birmingham or Manchester by accountancy practice count. Yet it has fewer top-tier AI-visible firms than Birmingham. The market is bigger; the ceiling is the same. The structural barrier to AI visibility isn't competition or budget – it's specific technical work most firms haven't done.
Roughly 59% of Greater London firms have an active LinkedIn presence – about twice the rate of Birmingham (32%) and Manchester (30%). London is more digitally established in general. But the average GEO score is only 6 points higher. The LinkedIn signal is the floor, not the ceiling. What separates leaders is the next layer of structural signals AI engines need.
Compared to Birmingham and Manchester, London firms are markedly better at the foundational signals – About pages, organisation schema, LinkedIn presence, llms.txt deployment. But the credentials layer – the one AI engines need to verify expertise in regulated industries like accountancy – is just as missing.
These are the 10 Greater London accountancy practices scoring highest on AI search visibility. They have specific technical foundations in place – schema, structured data, llms.txt, named credentials – that most of the field doesn't.
The highest-scoring firm in the entire SearchScore three-city dataset. Balanced strength across GEO, SEO and CRO – rare even in the top tier. Strong author credentials stack, llms.txt deployed, multiple schema types. A complete top-to-bottom AI-readability setup.
All three scores above 70 – only firm in the dataset achieving balanced excellence at this level. Structured services pages, FAQ content deployed, llms.txt in place, named partner credentials properly labelled.
Rainham-based firm punching well above its profile. Strong technical foundations: Article schema, FAQ schema, llms.txt all deployed. Demonstrates that location and size don't determine AI visibility – technical work does.
Surrey-based multi-office firm with a strong London catchment. Mature website infrastructure: comprehensive schema deployment, named partners with biographies, LinkedIn presence, content hub structure. One of the more established sites in the dataset.
Consistent strength across all three scores. Author biographies with credentials visible to AI – one of only five firms in the entire Greater London dataset with this in place. Multiple schema types deployed.
All three scores in the high 60s/low 70s – a balanced profile suggesting thoughtful website work. FAQ schema, Article schema, LinkedIn presence, llms.txt all deployed. The kind of complete stack the dataset rarely shows.
Strong AI readability despite slightly weaker SEO base. Author biographies with credentials, Organisation schema, LinkedIn presence. A firm that has invested specifically in AI visibility rather than just inheriting it from Google ranking.
Established Parsons Green firm with strong content infrastructure. Author bylines and biographies in place, Article schema deployed, content hub structure. AI engines can extract a clear picture of the firm and its expertise in a single pass.
CRO score of 76 – highest in the top 10. AI-driven traffic that lands on the site converts. Strong SEO foundation translating cleanly into AI visibility, supported by FAQ content and structured services pages.
Balanced performance across all three disciplines. Author Authority (E-E-A-T) deployed correctly, FAQ schema in place, content hub structure with consistent date markup. Demonstrates the discipline required to maintain a top-tier AI visibility score.
Top 10 named with consent. The remaining 141 firms anonymised – their data is included so the distribution is honest, but firms outside the top 10 are not identified publicly.
We've now audited 351 UK regional accountancy practices across three cities. London is a different market – larger, more digitally established, higher average scores. But the structural finding is the same: most firms display partner names, almost none label those credentials for AI.
Five firms cleared the 70 line. The author paradox affects 70% of firms.
More concentrated at the top – one firm clearly ahead of a tight pack.
Higher average. Fewer top-tier firms. The biggest market doesn't have the most visible firms.
We started with 233 Greater London-based accountancy practices identified from Google Places listings, ICAEW directories and local search results. Each firm was scored using the SearchScore audit framework – 250+ signals across AI search visibility (GEO), traditional search (SEO), and on-site conversion (CRO).
The benchmark publishes 151 firms after filtering. 61 firms returned incomplete audits – most due to bot protection (Cloudflare, captcha), site availability, or audit timeouts. 4 firms were excluded as part of national or international accountancy networks (TC Group, Sleek, Rayner Essex LLP) or because their domain already appears in our Birmingham benchmark (Tax Accountant), rather than the independent SME firms this benchmark measures.
The top 10 firms are named with consent – each was contacted before publication and given the option to appear, be anonymised, or request a wording change. The remaining 141 firms are anonymised. Their score data is included so the distribution is honest, but firms below the top 10 are not identifiable.
Two firms have partial SEO scores and one has a partial CRO score due to site availability issues during audit. These are included in the GEO ranking but marked as not measured for the affected sub-scores. The same audit framework was used for the Birmingham and Manchester benchmarks, allowing direct cross-city comparison. Full methodology is published at searchscore.io/methodology – replicable on any URL in 60 seconds.
The free SearchScore audit takes 60 seconds and gives you the same scores published here. The AI Visibility Programme – limited to five UK accountancy firms at founding rates – ships the fixes for you.