If I'm thinking of the same ad, I THINK it's a remix of "F.E.A.R.", by Ian Brown. The song itself is pretty clever, every line using the title's anacronym, e.g. "Forget everything and remember, For everything a reason..." etc. Not sure who's done this remix, but I know he's worked a lot with UNKLE, and Brown himself is on Indiepente records, if you want to google for their/his site.