Hubby and I are on BA275 on 8th September. Prefer the upper deck and my chosen seats would be 64J and K however they are taken. I've selected 60A and B on the basis that hubby (who prefers to face forward) won't then have anyone climbing over his legs. 64B is available - is it likely that 64A is taken or may it be blocked - not sure if it's a bassinet seat that may open up nearer departure?