Join Date: Sep 2005
Location: HEL
Programs: AY Platinum, TK Elite, BT VIP, AA, BA, SK, DL, NT, WB + hotels
Posts: 8,749
Codeshares definitely are a PITA, but I would have assumed a last minute cancellation to be straightforward and handled by BA in this case.
If you just fly to LHR and go to the BA desk, I wonder what they'll do.