The register
The register lists Black and Blum Limited in London as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. The register records its rating as Worker (A rating).
At Companies House the business is Black and Blum Limited (company number 03610810), a private limited company incorporated in 1998, 28 years ago. The registered office is at 40 Rushworth Street, London, SE1 0RB, SE1 0RB. Its filed activity puts it in wholesale. It has traded under other names before, including Dealtduty Limited.
For a candidate this means one less obstacle: Black and Blum Limited already has the licence most employers would have to apply for. The rest is the ordinary job of getting the interview.