I was considering going to F3K as well but this season they have started to use a really annoying policy of over21s and im 20 which is pretty irritating. I was ok to get in there all last season though which is a bit odd.
F3K is quality to watch the games in though, usually rammed with one room full of reds, the landlord is a legend as well! and yeh if you were there by 530 you would get in, its only the 6.45 mark that it began to get really full last year.
What does everyone think about sports cafe on haymarket (near trafalgar square) or possibly an away pub up by arsenal? Will defo try me luck at f3k at around 630ish but if that fails, may have to head to central.