The register
The register lists Rive Gauche London 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).
At Companies House the business is Rive Gauche London Limited (company number 09867646), a private limited company incorporated in 2015, 11 years ago. The registered office is at 19-20 Berners Street, 5th Floor, London, W1T 3NN, W1T 3NN. By its SIC codes the business is in professional and technical services.
For a candidate this means one less obstacle: Rive Gauche London already has the licence most employers would have to apply for. The rest is the ordinary job of getting the interview.