Two groups, novice/inter and inter/advanced. Seemed to work fine, because it was evening, I got the impression more riders rode there than van/trailered. I was in novice/inters, there were some very fast lads in it too, and a couple of instances of dodgy over/undertakes, but all in all just about right for me. Inters/fast tended to be litre plus/track type bikes. Only one red flag in our group, and the marshalls had the black flag out to a couple of riders early on. Plenty of room in the paddock too. One group on, one group off, so only 20 minutes between the sessions, four sessions each group, first group on at 5.30.