Replace British nationals with "Those pilots that have a valid UK work permit which includes those non-British nationals with settled status prior to 31st December. However, does not include Europeans (and other nationalities) seeking work in the UK for the first time. Unless they apply for a work permit which will not be possible in any industry for which there is no shortage of qualified professionals". A bit of a mouthful, but can't be put into a simple word or phrase unfortunately.