The register
The register lists Mono London Ltd in London 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).
Companies House lists it as Mono London Ltd, number 14459006, incorporated 2022: 4 years of filings behind the name. The registered office is at 63 Highstone Mansions 84 Camden Road, London, NW1 9DY, NW1 9DY. Its filed activity puts it in property. It has traded under other names before, including Senaf Limited.
Holding a licence is the expensive, slow part done. For Mono London Ltd the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.