The register
The register lists Heathrow Windows Ltd in Northolt as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. Rating on the current register: Worker (A rating).
Heathrow Windows Ltd is the registered name (Companies House number 11499853), a private limited company on the register since 2018. Registered office: 90b Meadfield Road, Slough, Berkshire, SL3 8HR, SL3 8HR. Its filed activity puts it in construction.
Holding a licence is the expensive, slow part done. For Heathrow Windows Ltd the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.