I too have filled out the form well before xmas but haven't been charged the £50 yet.
I've been in touch with BALPA about this but they are more difficult to get an answer out of, than bloody Ryanair.
I think that if they don't take the money I'll stay away, if they do, I'll demand it back.!!!
It would be interesting to find out just how many people have actually got an interview at all??
Our time will come again I promise us that much!