Malta Air operate any routes departing EU to UK, They already fly to most UK airports where the inbound flight is from EU and seem to operate to BHX, MAN and STN
with numerous flights per day, with my local airport being MAN they can operate upto 10 or more daily and the same with Buzz from Poland being the same, the only difference is Ryanair UK which UK based but operate in general non EU destinations but also EU outbounds mainly from STN and MAN and domestic flights