Hi @Mark736
I am also paid by Airbnb UK and it's indeed rather inconvenient the banktransfer has no reference included for us, only the amount and the date will be the connection to the Transaction History pages. On the other hand, payout's can be combined reservations (by "minimal payout level" set) or be re-calculated (by a negative amount from a previous (changed) reservation etc..). So the only solution maybe: Airbnb have to create at the payout's (in the "Future transaction list") an option to enter some personal reference. But i am rather sure i will forget to enter the personal information every time....
Best regards, Emiel