Thanks for the updates JW95.

Can someone clarify: I have F redemption seats on CX255 in late December (booked through BA). CX255 on the day in question is showing as a 77W. Assuming there is the expected equipment swap to the A350, am I right to assume that at best I will be downgraded to J on that flight? There is no chance, for example, of being accommodated in F on Qatar or BA on that day or later? (forgive me if the answer to this is obvious)

Edit: given the high prices of flights generally and zero award availability for my destination, I'd rather know now and make alternative arrangements than wind up travelling in Y (a possibility suggested upthread)

Edit 2: F looks sold out completely for CX255 on date in question. Would CX sell out the entire cabin only to downgrade everyone later?