Its not to bad the worst hill is probably between the 3rd and 4th miles as you climb out of the town centre, there is also another longish one between 9 & 10 miles at Westerfield and a short sharp one between 10 & 11 at Tuddenham. Hope you enjoy it.
I ran this in this event last year, you do go off the track for a while and then cross the road bridge before getting back on the perimeter path. Very friendly and well organised with drink stations and a tee shirt if you finished under 60 minutes.