Originally Posted by zaphod424

My understanding is that the outbound flight and at least 5 nights of the hotel/car need to be before 31/12. If that condition is met then all flights on the booking (assuming they have a BA flight no) will get double TPs, even if the return flight was in January for instance. But based on your example, no, you would not qualify as while the outbound is before the deadline, your 5 hotel nights are not.

It is entirely possible that the offer is extended into 2024, but I wouldn't count on it.