DOBEYPETE - A couple of questions, for clarity.
If the flight operated the following day, are you sure that 'cancelled' is the most appropriate word? It would appear that 'delayed' might be more accurate? If the flight was cancelled, it would surely not have operated at all?
If you were picked up at 19:45, is it possible that the rep provided accurate information on the coach, and neither she, nor anybody else knew about a delay, given that the flight might not have been at its' scheduled departure time from the UK at that point? - (AYT flight time from the UK is very approximately 3.5 hours.)