The register
The register lists Cavendish Philatelic Auctions Ltd. in Derby 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).
At Companies House the business is Cavendish Philatelic Auctions Limited (company number 10481282), a private limited company incorporated in 2016, 9 years ago. The registered office is at Cavendish House, 153-157 London Road, Derby, Derbyshire, DE1 2SY, DE1 2SY. Its filed activity puts it in other services. It has traded under other names before, including Spring and Palmer Limited.
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.