Blatently Sussex by the Sea. It's even better because it's one that only we sing (how many teams sing "we're by far the greatest team" or Hey Jude?), but it's a great tune as well.
'I live in Brighton I pay Brighton council tax I am not a Brighton wannabee I am season ticket Holder not a Johhny come big came etc' to the tune of men of harlem is my personal fav. and off to work