The register
The register lists John Rigby and Co 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 John Rigby & Co. (gunmakers) Ltd (company number 08493364), a private limited company incorporated in 2013, 13 years ago. Registered office: 13-19 Pensbury Place, London, SW8 4TP, SW8 4TP. Its filed activity puts it in manufacturing and engineering. It has traded under other names before, including Rigby Gunmakers Ltd, Rigby Gunmakers Limited.
What the licence tells a candidate is that the door is not locked. Whether it is open this month is a question for John Rigby and Co's own careers page and the job boards, and the answer changes with the season and the order book.