The register
The register lists Astra Mining Ltd 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 Astra Mining Ltd (company number 10706409), a private limited company incorporated in 2017, 9 years ago. The registered office is at Level 1 Devonshire House, 1 Mayfair Place, London, W1J 8AJ, W1J 8AJ. Its filed activity puts it in professional and technical services. It has traded under other names before, including London Infrastructure Ltd.
What the licence tells a candidate is that the door is not locked. Whether it is open this month is a question for Astra Mining Ltd's own careers page and the job boards, and the answer changes with the season and the order book.