... UK ATCOs can go and work in the sun for a few years and good English speaking Europeans can come to the UK.
Nice-sounding theory, but one wonders whether, like most other 'benefits' of EU membership, the UK, with open arms, will result as the dumping ground for all the barely-comprehensible rejects of the Continent, while there will always be unstated (read 'fictional') reasons why the UK ATCO is not accepted by the other country.
JC
... lights blue touch paper and retires ...