Can Offshore Workers Use a UK ETA? What Employers Need to Know
A crew change is planned for a North Sea platform. Flights are booked, the offshore rotation confirmed. At the UK border, the workers are questioned about their purpose of travel. The ETA they obtained grants them entry as visitors — but the activity they are travelling to carry out is work. They are refused entry. The project stalls.
This scenario is more common than it should be. Overseas maritime, energy and engineering companies regularly send crew, technicians and commissioning engineers to vessels, platforms and offshore wind projects in or around UK waters — often under pressure of tight mobilisation deadlines and without a UK company, payroll or sponsor licence. Against that backdrop, two pieces of advice circulate that create serious risk: first, that European nationals can obtain an Electronic Travel Authorisation (ETA) and enter as visitors to work offshore; second, that a Standard Visitor visa makes offshore work lawful simply because the work was mentioned in the application.
Neither is correct. This article explains the actual rules, when limited exceptions apply, and what a compliant solution looks like.
When does UK immigration control apply offshore?
UK waters, for immigration purposes, means the United Kingdom's internal waters and territorial sea — generally extending to 12 nautical miles from the coastline.
Under section 11A of the Immigration Act 1971, a foreign national who arrives in UK waters for the purpose of working there is treated as an offshore worker. Home Office guidance is direct: all offshore workers require permission to work before beginning work in UK waters, unless a specific exemption applies.
The position changes beyond 12 nautical miles, but distance must be established precisely and on the facts of each project. Many assignments involve movement between international waters, UK territorial waters, ports and offshore installations. An immigration assessment drawn from the project name or general location alone is unsafe.
What does an ETA actually allow?
An ETA is advance permission to travel to the UK. It is required by European and other eligible non-visa nationals who wish to enter as visitors and does not provide an independent right to work. A person travelling with an ETA is entering under the visitor route and remains subject to visitor conditions.
Paragraph V 4.4 of Appendix V: Visitor sets out the prohibited activities. A visitor must not take employment, do work for an organisation or business in the UK, provide goods and services, undertake a work placement or internship, or establish and run a business as a self-employed person — unless the specific activity is expressly permitted elsewhere in the rules.
None of these prohibitions are lifted by keeping the worker on overseas payroll, paying them outside the UK or describing the assignment as "offshore work".
Does a Standard Visitor visa solve the problem?
Not on its own.
A Standard Visitor visa and entry following an ETA are governed by the same restrictions on work activity. The difference between them is that visa nationals must obtain entry clearance before travelling, while eligible non-visa nationals may travel with an ETA. In either case, the proposed activity must fall within the visitor rules to be permissible.
Some companies take comfort from a previous case in which a visitor visa was issued after the offshore work was disclosed in the application. That decision does not establish a general immigration route. The grant of a visa does not widen the Immigration Rules. Border Force may still question the individual at the border, and Home Office visitor guidance instructs decision-makers to refuse entry where the proposed activity amounts to prohibited work. The facts of a previous case may also have been materially different. Each worker and assignment requires its own assessment.
When can an overseas engineer enter as a visitor?
There are limited permitted activities that may assist in genuine cases, but they must be identified by reference to the Immigration Rules rather than assumed from a worker's job title.
Paragraph PA 7 of Appendix Visitor: Permitted Activities allows an employee of an overseas company to install, dismantle, repair, service or advise on machinery, equipment, computer software or hardware, provided there is a qualifying contract of purchase, supply or lease with a UK company or organisation and the overseas company is the manufacturer or supplier, or is party to an after-sales or warranty arrangement agreed at the time of the original sale or lease.
This may assist a genuine specialist commissioning engineer in certain circumstances. It does not create a general exemption for everyone carrying the title of technician or commissioning engineer. The contractual chain, the identity of the manufacturer or supplier, the equipment involved and the precise duties must all support the exception. It will not normally cover workers filling an operational role on the UK project, providing general labour or routine services, undertaking substantive construction or installation work for a UK client, supplied as additional crew, or effectively filling a UK-based vacancy on a temporary basis.
Are vessel crew exempt as seafarers?
The seafarer provisions are frequently misread as broader than they are.
Section 8(1) of the Immigration Act 1971 can apply to a crew member arriving on a ship where their engagement requires them to leave the UK as crew of the same vessel. Separate provisions exist for contract seamen joining vessels that are due to leave UK territorial waters.
However, Home Office seafarer guidance is explicit: crew working on vessels that visit more than one place in the UK — including a port or a platform — cannot benefit from the section 8(1) exemption and are to be treated as offshore workers requiring permission to work. The vessel's route and purpose matter as much as whether a person is described as crew.
The particular problem for overseas companies without a UK entity
An overseas employer may have no UK subsidiary, branch or sponsor licence. That can make the usual sponsored work routes more difficult to access — but it does not convert operational offshore work into a visitor activity.
The correct solution will depend on the facts and may involve considering whether a UK company involved in the project can lawfully sponsor a genuine role; whether the Skilled Worker route is available for that role; whether a Global Business Mobility route — such as the Service Supplier route — applies to the contract and the worker; whether a specific visitor permitted activity genuinely covers a particular specialist; whether an individual already holds leave allowing the work, such as status under the EU Settlement Scheme or a Frontier Worker Permit; or whether the project, vessel movements or mobilisation arrangements can lawfully be structured differently.
These are not interchangeable options. A UK client cannot simply sponsor personnel who are being supplied to fill its vacancies, and every sponsored route carries requirements relating to the sponsor, the role, skill level, salary, the contractual arrangements and the genuineness of the job.
What are the risks of getting this wrong?
Sending personnel to carry out offshore work on only an ETA exposes both workers and businesses to significant consequences. Workers may face questioning, detention or refusal of entry at the UK border, with an adverse immigration history that affects future travel. Projects face disrupted crew changes, cancelled rotations and mobilisation delays that carry direct commercial cost.
Where the statutory tests for illegal working are met, there can be civil or criminal consequences. Sponsor compliance action may follow for any licensed organisation involved. And the reputational and contractual damage from a border refusal at the outset of an offshore project can be lasting.
The fact that a worker is employed and paid overseas does not change the analysis. What matters is whether the activity taking place in UK waters is permitted by that individual's immigration status.
What should be checked before anyone travels
An effective offshore immigration assessment should examine the vessel's name, type, flag and function; its expected route, ports, platforms and working locations; whether and for how long it will operate within 12 nautical miles; whether it will visit more than one location in UK waters; each worker's nationality and existing UK immigration status; the precise duties of each person rather than their job title; the employing and paying entity; the full contractual chain between the overseas employer, any agency, the vessel operator and the UK client; any purchase, supply, lease, warranty or after-sales agreement; the equipment being installed, repaired, serviced or commissioned; the duration and rotation pattern of the assignment; and whether any UK party holds the appropriate sponsor licence.
This work should be completed before workers are selected, flights booked or letters describing the purpose of travel are issued.
How Visa Professionals can help
Early immigration advice for offshore projects is not a formality — it is how border problems, project delays and compliance exposure are avoided. Visa Professionals advises overseas employers, crewing agencies, vessel operators, engineering companies and UK project clients on the immigration arrangements for offshore personnel from the outset of a project.
We assess whether work falls inside UK territorial waters, review vessel movements, personnel duties and contractual documents, distinguish genuine crew exemptions from work requiring permission, advise on Skilled Worker and Global Business Mobility options, prepare compliant visa applications and supporting representations, and help businesses develop a compliant mobilisation plan that fits within the project timetable.
If your company is planning to send overseas crew, technicians or commissioning engineers to a UK vessel, platform, offshore wind farm or other offshore installation, contact Visa Professionals before mobilisation. The immigration route should be established before workers travel — not tested at the border.
Important: This article provides general information only. Offshore immigration cases are fact-specific and the law and Home Office guidance may change. Specific advice should be obtained before any worker travels or begins work in UK waters.