Sure - we can always buy advanced technology of the yanks......... just like the F-35.....
All our recent combat aircraft have been co-operative - you have to go back 30-40 years to the Harrier and the Buc. for a 100% UK aircraft - (and a lot of the later Harriers had US input)
We won't put the money into a European programme and we certainly can't afford our own so it's another technology scratched off the list