I've only done two transatlantic flights in my lifetime, but I've not had any problems after arriving back in the UK (I'm told that it's when time jumps forwards it kicks in?). I landed at LHR 2.30pm yesterday and was in the office for 9am this morning - so far no sign of any problems. Famous last words.
In related news, I appear to have lost an hour of my life during the trip to Seattle [oh]. Because of the UK and USA having different change-over dates for day-light savings I go through the +1 jump twice, but will only go through the corresponding -1 once.
What number do I call to claim my hour back?