The register
The register lists ECI Schools 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).
Companies House lists it as Eci Schools, number 08109626, incorporated 2012: 14 years of filings behind the name. The registered office is at The Stanley Building, 7 Pancras Square, London, N1C 4AG, N1C 4AG. By its SIC codes the business is in other services.
For a candidate this means one less obstacle: ECI Schools already has the licence most employers would have to apply for. The rest is the ordinary job of getting the interview.