The register
The register lists Bestrustees Limited in London as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. Rating on the current register: Worker (A rating).
Companies House lists it as Bestrustees Limited, number 02671775, incorporated 1991: 34 years of filings behind the name. Registered office: 1 Cornhill, London, EC3V 3ND, EC3V 3ND. By its SIC codes the business is in professional and technical services. It has traded under other names before, including Bestrustees PLC, Bes Trustees PLC.
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.