The register
Cabinet Office is licensed to sponsor on Skilled Worker and Government Authorised Exchange. Its entry on the register dates back to at least 2026, and the organisation is based in London. Its rating on the register is Worker (A rating), Temporary Worker (A rating).
At Companies House the business is The Cabinet Office Ltd (company number 05756325), a private limited company incorporated in 2006, 20 years ago. The registered office is at Unit 3 Station Yard, Station, Road, Hatton, Derby, Derbyshire, DE65 5DU, DE65 5DU. Its filed activity puts it in business services.
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.