Originally Posted by
LondonElite
More facts would indeed help, though I believe the fare rules on ex-EU tix are more relaxed than ex-UK in the same selling class (I fares come to mind).
But most cheap fares will still have something along these lines:-
PASSENGERS WHO NO-SHOW FOR A FLIGHT WILL BE CONSIDERED AS A CANCELLATION AFTER DEPARTURE AND WILL RECEIVE NO REFUND OF THE FARE. CHANGES WILL NOT BE PERMITTED.
So if you miss your flight, you're at the mercy of BA's discretion.