I know of British Airways executives who flew from London to New York on Concorde only to attend meetings from which they returned again the same day without having left the airport.
I've done Heathrow -> Dulles -> meeting in Sterling, VA -> Dulles -> Heathrow same day. It's not fun, but it's also not that unusual, even without the Concorde.
UK -> US east coast works reasonably well that way, given that the flight is 5-6 hours, and 5 hour time difference, so you can get on a flight early morning from London, arrive early morning at the east coast, have your meeting and catch an evening flight back out which'll arrive back in the UK in the morning local time.
Granted, I'm not in the same boat as exec's, but I'm a student and have had dealings with people from other universities in the UK (I'm irish), and I have flown, met them in airport hotels, and flown home same day or first flight following morning.
