If your organisation hires internationally — or if you're building HR tech that handles UK right to work compliance — you need to understand the Register of Licensed Sponsors. This post covers how the register works, how to query it programmatically, and what compliance teams need to know when verifying whether an employer can legally sponsor a UK visa.
What Is the Register of Licensed Sponsors?
The Register of Licensed Sponsors is a public database maintained by the UK Home Office. It lists every organisation currently approved to sponsor overseas workers on UK work visas — including the Skilled Worker route, the Senior or Specialist Worker route, the Graduate route, and others.
Employers must hold a valid licence to assign a Certificate of Sponsorship (CoS), which is the document a visa applicant submits with their application. No licence = no CoS = no visa.
The register is updated every working day and is available as a free CSV download from gov.uk.
Data Structure of the Register
When you download the CSV, you'll find the following columns:
- Organisation Name — the legal entity name, not necessarily the trading name
- Town/City — location of the registered office
- County — administrative county
- Type of Sponsor — either "Worker" or "Student"
- Route — specific visa routes the licence covers (e.g., Skilled Worker, Scale-up, Seasonal Worker)
Note: there is no licence expiry column, no contact details, and no API endpoint. It is a flat file updated daily.
Querying the Register: Technical Approaches
Direct CSV Download
The download URL from gov.uk changes occasionally, but the canonical access path is on the gov.uk website under "workers and temporary workers sponsor register." For production systems, it's better to scrape the gov.uk page for the current link rather than hardcoding a URL.
Automated Daily Sync
If you're building a compliance tool or HR platform, a sensible architecture is:
- Fetch the latest CSV every morning (the gov.uk page lists the date of the last update)
- Parse into a local database or searchable index
- Expose a search endpoint to your internal tooling
This is exactly the approach platforms like ImmigrationGPT (https://immigrationgpt.co.uk) use to give users real-time sponsor lookup alongside contextual guidance on UK immigration rules.
Fuzzy Matching Gotchas
Exact string matching won't cut it for employer names. Common issues:
- Legal vs. trading names: "Tesco Stores Ltd" vs. "Tesco" — the register uses the legal entity name registered with Companies House
- Group structures: A parent company may not hold the licence; a subsidiary might. Each entity needs its own licence.
- Abbreviations and punctuation: "Ltd" vs "Limited", "&" vs "and", spacing in names
- Multi-site employers: One licence can cover multiple locations, but they all appear under the same legal name
Recommendation: implement trigram similarity search (e.g., PostgreSQL's pg_trgm) or a fuzzy matching library, combined with a manual review workflow for near-matches.
Licence Ratings: A-rated vs B-rated
Sponsors appear on the register as either A-rated or B-rated.
- A-rated: Fully compliant. The Home Office is satisfied with their sponsorship duties.
- B-rated: On a Home Office action plan. They can still sponsor workers, but they have identified compliance issues they must resolve. For HR teams, this is a yellow flag — not a blocker, but worth noting.
Licences that are suspended or revoked are removed from the register entirely. If an employer is not listed, they cannot currently sponsor a visa applicant.
What HR Compliance Teams Should Monitor
For ongoing compliance, your team should:
- Verify before making an offer contingent on sponsorship — confirm your own licence is active and the relevant route is listed
- Monitor the register for any change in your own status — set up a daily automated check against your entity name
- Track CoS allocation — the Home Office allocates a defined number of CoS per employer; running out requires applying for more, which takes time
- Log right to work checks — as a sponsor, you are required to maintain records that can be audited by UKVI
Why This Matters Post-Brexit
Since the end of free movement in January 2021, the volume of Skilled Worker visa applications has grown significantly. The Home Office has responded with more active compliance visits, higher civil penalties for unlicensed working, and increased scrutiny of sponsor duty compliance.
For HR tech builders and compliance teams, the register is foundational infrastructure. Tools like ImmigrationGPT (https://immigrationgpt.co.uk) layer natural language guidance on top of this data, helping HR teams and applicants understand not just whether a licence exists, but what it means and what to do next.
This post is for informational purposes only. UK immigration rules change regularly. For legal advice specific to your organisation's circumstances, consult an OISC-regulated immigration adviser or solicitor.
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