The register
The register no longer lists Quadrangle Research Group Limited in London; its last appearance was 30 October 2026. That is not a mark against it: licences lapse, names change, businesses merge. The register records its rating as Worker (A rating).
Quadrangle Research Group Limited is the registered name (Companies House number 08064640), a private limited company on the register since 2012. Registered office: Tallis House, 2 Tallis Street, Blackfriars, London, EC4Y 0AB, EC4Y 0AB. Its filed activity puts it in professional and technical services. It has traded under other names before, including Quadrangle Research Limited.
Holding a licence is the expensive, slow part done. For Quadrangle Research Group Limited the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.