5 Best Notary Public in London (2026)

Notary.co.uk is a notary public and legalisation firm based in central London, working with both private clients and businesses on documents headed to countries worldwide. The firm offers a fully mobile service alongside its office appointments, and much of its work centres on next-day apostille processing through the FCDO. Its site lists over 40 years of combined experience across the team.

iNotary Public runs a Waterloo office offering notarisation, FCDO apostille, and consular attestation, with both in-person and mobile appointments available. The firm is a member of The Notaries Society and regulated by the Faculty Office of the Archbishop of Canterbury. Reviewers frequently mention coordinating the whole process from overseas, with documents couriered on afterward.

Castelo Notaries operates from Victoria and offers notarisation, legalisation, and certified translation, with dedicated Portuguese and Spanish solicitors departments alongside its notarial services. The firm promotes a same-day premium service for clients who need documents notarised, legalised, and translated and back in hand within 24 hours.

S Thomas Notary Public operates from Lincoln's Inn Fields in Holborn, offering notarisation and legalisation services to clients across London and beyond. Unlike the larger firms on this page, appointments here are handled personally by the named notary rather than a rotating team, and the firm's own site lists coverage extending out to west London and Heathrow-area clients.

Westminster Legalisation Services is based on St Martin's Lane and focuses on apostille legalisation, including express next-working-day turnaround for documents like criminal record certificates and sworn translations. Reviewers describe coordinating collection and international shipping from outside the UK, with the firm confirming receipt and progress at each stage.