Saw machine head last night at the academy and they kicked major ass, the set-list was brilliant other than I think they missed out crashing around you, I may have been at the bar at that point. They even played some covers near the end of pantera, sepultura, metallica n black sabbath.
If you can catch em on this tour I highly reccomend it, especially if you can get to the brixton academy, they're using that gig to film a new live dvd.