I'm not 100% sure, but i think that Campaign Power had 9-10 players committed to on field judging. I believe there is a standard number of on field judges for the Millenium series.
My point is that whatever you can do to make the on field judges job easier should help achieve better judging. Providing the judges with frequent breaks, and doing as much as you can to keep them happy, will keep them fresh and on their toes.
I don't want to come across seeming like i'm totally down against the M25 tourney, i really think it was a good event, and i expect that it will only get better in the future. The only reason i'm picking on the judging is because i know if i had been playing i would have been really upset with the quality of 'some' of the judging. Like i said already, it's understandable if you miss a tough call, it happens even to really good judges, but you have to get the basics.
One very positive thing i saw was a lot of players calling paint checks on themselves. And the funniest thing i saw was a player from a UK pro team (not naming names, sorry) get fully gogged, and dive into his baracade to escape the judges. Luckly the judges (and everyone watching) saw this and he was out of there double quick, but he got totally puntered and he didn't walk right away. Oh well, i guess when you're that good, you have to push the bounderies a bit