I searched and couldn't find an answer to my question, so apologies if it's been asked before.
It's a hypothetical question for now. If I book BA Reward Flights now, using the maximum number of Avois, to ensure I get flights on the dates I need, would it be possible to change the flight times in a couple of month's time? Would I loose the Avios if I ended up having to pay with cash because there were no Reward Flights left? Can I transfer the Avios to another booking on a Reward Flight etc etc? I know it sounds a crazy question but there's a good reason.