The register
The register lists JM Convenience Store Limited in Luton 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).
JM Convenience Store Limited is the registered name (Companies House number 08571062), a private limited company on the register since 2013. Registered office: C/O Saashiv & Co. Pentax House South Hill Avenue, South Harrow, Harrow, HA2 0DU, HA2 0DU. Its filed activity puts it in retail.
A licence says an organisation may sponsor; it does not say it is hiring today. The way to find out is the same as for any employer: the careers page, the job boards, and a direct approach with a UK-style CV that says early that sponsorship would be needed.