Prehaps foolishly, but with the potential of a match to BA Silver from BMI Gold, I've booked some long haul flights with BA in the next weeks as I think I'll give BA a go for a while. Given the 20th Apr date, I realise that I probably won't have BA status, but was wondering should I open a BA account to credit these miles or wait and retrospectively claim them ?

Understand that it's a guessing game - but no harm in asking for opinions