I'll be watching at the Famous 3 Kings in West Kensington. Right next to the tube station, has about 20 screens in. Always gets a good turn out of Saints fans. Might see you there! COYR.
Get yourself up mate. The land lord is a Liverpool fan (I think) but has a soft-spot for Saints so it usually generates a pretty decent atmosphere. I went in for the Derby play-off game a few years back and it was packed with Saints fans.