The register
The register lists The Oak Tree Practice Group Limited in London as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. Its rating on the register is Worker (A rating).
The Oak Tree Practice Group Limited is the registered name (Companies House number 11933006), a private limited company on the register since 2019. Registered office: 293 Kenton Lane, Richman And Company, Harrow, HA3 8RR, HA3 8RR. Its filed activity puts it in health care.
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.