If it's the same one I'm thinking about (the one that ends up with David Beckham - "the most powerful right kick") the music was the theme tune from Law and Order - I am pretty sure it doesn't have another name, I will try and find out.
make sure you've got the current Law and Order theme - I downloaded it and got the wrong one as well!. The current one is orchestral sounding, very dramatic, definitely the one on the ad!
yup, Rob Dougan it is - there are plenty of versions on WinMx, I have downloaded a version with singing, and am currently downloading the instrumental version. Another little mystery explained (although I can understand why Channel 5 didn't like the twee original theme)