As a start, I'd be happy to just close our 20+ military bases in the UK. We have enough 'power projection platforms' (as NEO-CONS like to call them) already, throughout the rest of Europe.
I mean, who are we protecting the UK from? Mighty Iceland to the north? The dour Irish to the west? The pugnacious Norwegians to the east? The wine-sipping French to the south?
Too many goodly Americans still think there is an East and West Germany!