Originally Posted by
DWFI
You were charged a transfer fee to preserve your upgrade because
their flight went tech???
I read it as the OP has a xxx-LON ticket on BA and a yyy-xxx ticket on someone else. That went bang. They couldn't get to xxx in time to make the BA flight. BAEC managed to sort their change to the next day, preserving the MFU.
Good that they could help but probably not too remarkable - I am assuming there was still award space on the next day's flight, and having flown the outbound leg the change back by 24 hours of the underlying fare was either not subject to an extra charge of much, or they couldn't be arsed to calculate it.
But you never know, they have been more of a rule bend than that which helped the OP out.