I'll pitch in for the pro 20-mile race camp. Did one at the end of March, 6 weeks before the marathon, bimbled round in 2:16 so average pace of 6:49 and then did the full at 6:45 pace. I reckon it is horses for courses, for me doing 20@MP was a big confidence thing and I will do so again this year, so racing Finchley 20 on March 11th. It was at the end of a big 2 weeks, my biggest weeks at 62 each, then the speed up and distance down phase started.