The register
The register lists Gravis Advisory Limited 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 Gravis Advisory Ltd, number 09910124, incorporated 2015: 10 years of filings behind the name. The registered office is at 24 Savile Row, London, W1S 2ES, W1S 2ES. Its filed activity puts it in finance and insurance. It has traded under other names before, including Gcp Advisory Limited.
What the licence tells a candidate is that the door is not locked. Whether it is open this month is a question for Gravis Advisory Limited's own careers page and the job boards, and the answer changes with the season and the order book.