The main potential problem here is whether work in the UK after 1 July 2021, after which a frontier worker permit (FWP) has been required to enter the UK to work on that basis, where entry after that date had been without such a permit (eg via an eGate), constituted a breach of immigration law. And if so, whether that breach would lead to the application for an FWP being refused. In relation to the second question, even this constituted a breach of immigration law (for which see below), this would be unlikely to lead to refusal of the application. The suitability requirements for these applications are based on EU law refusal grounds, which have a much higher threshold than UK immigration applications under the Immigration Rules, Part 9. As explained in the Practice Note: Applying for a frontier worker permit, the