wellllllll... read any book on practical politics etc and you'd be amazed how interwoven the UK & the US are in defence and strategy at a working, day-to-day level
Things like GCHQ and NSA are hand in glove, the Brits normally have at least one senior senior civil servant at RAND working (sorry "assisting") on US military issues such as the Future Bomber
And of course we play games - say the USMC are having problems with the Administration on a piece of kit - they get the Brits to bring it up which escalates the issue and improves their chances of getting their way ("look! it's not just us who think this is a great idea!") and they do the same for the RN or RAF in the future
We have cross posting of personnel, we share new technology (the drive for most modern SSN's is a British invention) and we get missile technology at cut -price in return.
WIKILEAKS listed a whole slew of UK companies that provide top secret kit to the Americans