I think the problem might have been at around 8k; the runers went diagonally across the field at the top of the hill, but I suspect we were supposed to go round the edge. When I got to the exit of the field, I saw the 8k mark about 50m to my right; annoying because by my calculation I would have got a PB regardless
I think you're right but I don't think this alone would have accounted for the 500m difference and I remember seeing markers on the floor at this point because I almost turned around thinking I'd gone wrong - until I saw the markers.
Feel particularly sorry for anyone who would have achieved a PB - almost relieved I missed mine now!
My GPS said 9.49, really gutted thought I'd had a really good run - not so sure now.
I think the course may have gone wrong around the 8k mark as we got back into the park - very few signs and marshalls. I heard one of the marshalls say something about the runners following each other and may have missed some of the course.
If so then it's really taken the shine off a great day in other respects.