Useful info again mr Flyer. Luckliy my wife had a schgen visa for our trip to paris last year in august when the massive uk airport security crackdown was a week old.
After a few lovely days in paris we had the delay and an extra nights stay at a very nice novo hotel near paris courstey of CDg (smashing buffet breakfast there)
We had already gone past passport control and on the way back out we didn't get my wifes visa stamped again for reentry as the staff were not bothered so the next day the passport control guy looked a bit puzzled but let us though once we said the flight was delayed blah blah. Im sure with the wrong officer that could have caused a little panic.