The register
The register lists Opera Rara in London, London as a licensed sponsor on Creative Worker, an entry that goes back to at least 2026. The register records its rating as Temporary Worker (A rating).
Companies House lists it as Opera Rara, number 00982535, incorporated 1970: 56 years of filings behind the name. Registered office: Studio 11 Cloisters House, 8 Battersea Park Road, London, SW8 4BG, SW8 4BG. Its filed activity puts it in it, software and media. It has traded under other names before, including Opera Rara Limited.
What the licence tells a candidate is that the door is not locked. Whether it is open this month is a question for Opera Rara's own careers page and the job boards, and the answer changes with the season and the order book.