RT, I also was entered into the Glous 50km, hopefully they will reschedule on a weekend I can run!
I have entered this for the 3rd year running now, really enjoy this run. Relatively flat first half then a couple of hills - one being the Cherhill monument and then undulating to Avebury, a drag over the ridgeway and a nice fast last 3 miles that you can enjoy.
Navigation is not too bad, only place you need to watch for is on top of the monument - I have run around there both years to my embarrisment! Arrows tend to be out at trickier points and feed stations are about 4 miles apart.
Edited: 21/01/2013 at 14:21