I participated in the 2009 NOSH Footrace. But only as a walker. It was 15kms of muddy trails and rocks to scramble over. There were sections which were technically more difficult than any of the Oxfam trail but I think that was due to the extra water on the trail. There was a section where Julie had to sacrifice her (at the time) dry left food and I had managed to sink into a very deep mud hole. Julie and I managed to finish in just under 3 hours. Even if the last 1km was a lot longer than any 1km I had walked before!
Nikki somehow managed to run the 15kms in a very respectable time.
Photo is of my very muddy trailwalker shoes!