not 100%
but we have marshalled along side the manchester marshalls 2003, we always have 6 marshalls , 4 in the corners moving up with play and two in the centre one which is normally the ultimate ,
field sizes , i have heard the millenium sizes are being made smaller ?
when we train we set our field up at 55M by 30m 7 man
45M by 30M 5 man
hope this helps oh ive mailed you regarding the cocker dude