Hey man, it is by Leftfield. It's called Phat Planet. If you like it, check out the Dave Clarke remix too.

> > I WOULD LOVE TO KNOW THE TUNE PLAYED ON THE GUINESS COMMERICIAL, WHERE THERE IS A SURFER WHO SURFS WITH WAVE OF HORSES... PAOWERFUL STUFF AND TOO GOOD TO GO UNOTICED
> tune is by leftfeild last album