UK accountants hold what's possibly the most retention-heavy data set in any UK SMB sector — six years minimum for HMRC, often longer for client trust accounts, dispute logs, AML records. Where it lives matters not just at the moment of capture but every day across those years.
Most Leeds accountancy websites have been quietly built on US-resident SaaS — Squarespace + Mailchimp + HubSpot is the typical small-practice combo, and every piece of that stack processes client data on US infrastructure. Even practices using Xero (AU-based) or FreeAgent (UK) for the practice-management layer often have the public-facing website on US-resident WordPress or Wix. The ICAEW pillar article walks the 4 failure modes — this page is the Leeds-specific shape of that work.
A Leeds accountancy practice doesn't just need to be found when small business owners search "accountant Leeds LS28" or "limited company tax adviser Roundhay" — it needs the data-residency posture to hold up at the next AML supervisory visit, professional-indemnity renewal, or ICAEW practice review.