The register
The register lists Danny Sullivan & Sons Ltd in London as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. Rating on the current register: Worker (A rating).
Companies House lists it as Danny Sullivan & Sons Ltd., number 02670127, incorporated 1991: 34 years of filings behind the name. The registered office is at 22 Barretts Green Road, Park Royal, London, NW10 7AE, NW10 7AE. By its SIC codes the business is in construction.
Holding a licence is the expensive, slow part done. For Danny Sullivan & Sons Ltd the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.