The register
The register lists Harts News in London as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. Its rating on the register is Worker (A rating).
Companies House lists it as Harts News Limited, number 06398225, incorporated 2007: 19 years of filings behind the name. The registered office is at 340 Norwood Road, West Norwood, London, SE27 9AF, SE27 9AF. Its filed activity puts it in retail. It has traded under other names before, including Harts Ltd.
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.