Either at home or at a pub that shows televised sports.
I don't imagine a pub would be easy to find, as it's hard enough to find one that shows American pro football. Then again, there are plenty of graduates of big U.S. state universities living in London, so if it's possible to pull the games from a satellite there has to be somewhere that shows Texas, Ohio State, Alabama, USC, Michigan, etc. games.
Otherwise I know you can get ESPN America from Virgin cable, but that's just the one channel (not enough to cover multiple games happening simultaneously on fall Saturdays and have the game you want). Are there other special satellite packages, or a good site to watch on the Internet that will work from a UK IP address?
Thanks