Originally Posted by SK AAR

Well, BA may try to argue that you were rebooked and departed on the PHL flight less than 1 hour earlier than scheduled departure time of BA213 but given that you arrived a completely different airport, I believe there are good arguments that you arrived at final destination with a delay of 2 hours or more; hence GBP 520 is due IMO.

I fail to understand why reimbursement of the hotel at PHL was rejected. Could it be that you made the claim in haste without specifying what you are actually claiming for? (one need to keep it short and concise when making such claims as not be misunderstood).