Hate to rub it in, mate, but we booked a restaurant weeks and weeks ago to ensure we didn't have that problem!
They are showing the Liverpool game on the Wembley concourse so you could get in there, freeze your nuts off and enjoy your £10 burgers and £6 pints of piss whilst constantly being barged by pissed up lads jumping around singing songs. ;-)
JJ Moons is big, has a big screen and does what you need although it does get busy. Get in there early and grab a table and you're laughing.
Sadly I don't have such foresight! Might give JJ Moons a try...