Lock, Stock and Two Smoking Barrels

If anybody knows anything about the soundtrack or score to "Lock, Stock and Two Smoking Barrels", what song is playing right at the beginning with the base guitar. It is repeated a couple times in the film as well.

If anyone can help me out with this, it would be greatly appreciated

Thanks

http://www.killermovies.com/out/amazon.php?B00000I3ZS

They have the listings there.

The song in question doesn't appear to be on the soundtrack