I've always wondered this, but, when you have a blatant disallowed goal in something important as a Champions League match and you criticise the ref, does anything actually happen? (aside from you getting a touchline ban) but when the decision shouldn't have happened? I had 2 disallowed goals against Shakhtar for Leeds in a game that would have given me a fantastic advantage to qualify, but I ended up losing 2-1, so I was wondering whether anything actually happens when you complain to the FA?