Glossary

Plain-English explanations of common UK immigration terms. Information only — not advice.

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30 terms
Certificate of Sponsorship (CoS)

A reference number assigned by a licensed sponsor for certain work routes. It links to the job and sponsor details used in an application.

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Sponsor licence

Permission for an organisation to sponsor workers or students under specific UK routes, subject to ongoing compliance duties.

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Immigration Health Surcharge (IHS)

A charge paid by many applicants for access to the UK’s NHS during their permission to stay.

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Biometrics

Fingerprint and facial image collection used to confirm identity as part of the application process.

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Biometric Residence Permit (BRP)

A physical card previously used as evidence of immigration status for some people. Digital status is increasingly used; check current guidance.

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Right to work check

Checks employers carry out to confirm someone is allowed to work in the UK under immigration rules.

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Confirmation of Acceptance for Studies (CAS)

A reference number issued by a sponsoring education provider, used to support a Student route application.

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Indefinite Leave to Remain (ILR)

Permission to live in the UK without time limits, sometimes called ‘settlement’.

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Leave to remain

Permission granted to stay in the UK for a particular purpose and time period under the Immigration Rules.

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Entry clearance

Permission to enter the UK granted before travel for routes requiring a visa.

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Vignette

A visa sticker placed in a passport in some cases. Often time-limited and used for initial travel.

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Priority service

An optional paid service (where available) that may shorten decision times. Availability varies.

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Dependant

A family member who applies as part of a main applicant’s route (where the rules allow).

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Maintenance funds

Money you may need to show you can support yourself (and dependants) without relying on public funds.

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English language requirement

A requirement on some routes to demonstrate English ability through an approved test or other permitted evidence.

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Genuine Student requirement

A Student route requirement relating to intention to study and meeting route conditions.

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Occupation code

A code used to classify job roles for sponsorship and salary threshold checks under eligible occupation lists.

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Salary threshold

A minimum salary level required under some routes. It can vary by role and circumstances.

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Switching

Applying inside the UK to change from one immigration route to another, subject to route rules.

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Curtailment

Shortening of permission to stay, for example if sponsorship ends or conditions are not met.

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Administrative review

A process to request that a decision be checked for errors, available in certain circumstances.

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Appeal

A legal process to challenge certain immigration decisions, available only for some decision types.

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Immigration Rules

The formal legal rules setting requirements for visas and leave to remain in the UK.

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Appendix (Immigration Rules)

A section of the Immigration Rules containing detailed requirements for a route or topic.

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Sponsor duties

Ongoing obligations on a sponsor, such as reporting changes, keeping records, and ensuring compliance.

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Caseworker

An official who assesses an application against the Immigration Rules and guidance.

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Public funds

Benefits and support that many visa holders are restricted from accessing; restrictions depend on conditions.

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Conditions of stay

Restrictions attached to permission, such as work limits or ‘no recourse to public funds’.

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IHS

Common abbreviation for the Immigration Health Surcharge.

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CoS

Common abbreviation for Certificate of Sponsorship.

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Tip

Use the Library pages for route overviews, and Fees/Timelines for planning.