The register
The register lists Castles Security And Fm Limited in Berkshire 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 Castles Security and FM Limited (company number 11795867), a private limited company incorporated in 2019, 7 years ago. Registered office: Office Number 334 160 London Road, Barking, IG11 8BB, IG11 8BB. Its filed activity puts it in security, cleaning and facilities. It has traded under other names before, including Castles Security Limited.
For a candidate this means one less obstacle: Castles Security And Fm Limited already has the licence most employers would have to apply for. The rest is the ordinary job of getting the interview.