The register
The register no longer lists Guardian Professional Corporate Services Ltd in London; its last appearance was 23 October 2026. That is not a mark against it: licences lapse, names change, businesses merge. Rating on the current register: Worker (A rating).
Guardian Professional Corporate Services Ltd is the registered name (Companies House number 14188843), a private limited company on the register since 2022. Registered office: Berkeley Suite 35 Berkeley Square, Mayfair, London, W1J 5BF, W1J 5BF. By its SIC codes the business is in it, software and media.
A licence says an organisation may sponsor; it does not say it is hiring today. The way to find out is the same as for any employer: the careers page, the job boards, and a direct approach with a UK-style CV that says early that sponsorship would be needed.