He was fair - 6. I would agree with the above. Burton got away with too much routine shirt-pulling and time-wasting. I also thought there was one penalty, but to be fair to the ref, it's very hard to be confident in the middle of a melee like we saw on Saturday.
The current practice seems to be quite severe on any foul play below the waist (trips, late challenges) but very lenient about any arm wrestling or shirt-pulling. Is this official policy? I can see it protects the players almost completely from risk of injury, but the kind of cynical holding that prevents a breakaway spoils part of the game.