I’m sure this has been asked ad nauseum but I can’t find the answer. I put this question on the Avios wiki too, not sure where’s best so just delete as appropriate

Im looking at flights from LHR-SFO/SJC for May next year. They’re currently around 1700 direct in Club World. But I want to add on a couple of nights hotel so I only have to put down a deposit.

According to BA.com there are reward seats in F around the dates I’m looking at but how do I know what business fare class it’ll book into on BA hols & if the flights can be upgraded to F?

Thanks