I ask because when I broached the subject during a call with BA Executive Club to change the departure date, the agent, rather irritably said, "Well, you might be able to talk to Customer Relations about this." I didn't at the time, deciding to deal only with the departure change, rather than complicate the call. However, it was hinted I might be able to cancel the entire trip, get a refund for the whole trip. Then rebook everything all over again. I was afraid I'd mess up my trip, my miles, etc., or not have the frequent flyer seats available. So I haven't done anything. Yet.