I have searched but couldn't find the thread, but know i've seen it before.

How easy is it to change who you have credited the flights to after you have flown and the miles/tp's have been awarded.

My reason is I didn't think I would be flying back to the UK from Australia twice within 6 months, I credited my first flights to BAEC as just wanted to build up avios to spend over here, but now the second set will get me bronze which isn't really much use here apart from priority check in and boarding. If I had credited them to Qatar I would get silver with them which still wouldn't give much but if using Qatar they give lounge access.

So how much of a ball ache is it or can it still be done??