I'm sure people on this group will be arranging recce runs closer to the date of the race. You are also welcome to use this RW thread, but people on Facebook may be more responsive.
Whilst I don't formally arrange anything myself, I generally go out and run the route, or sections of the route, prior to the event. If I do, I'll communicate this on the aforementioned community site.
It's definitely a good idea to recce some of the route. Whilst we provide markings along the route during the race, it can be easy to make mistakes, particularly later on in the race when you are tired etc.
Can I also point you towards the Stour Valley Marathon, which I helped out at last year. The marathon goes along approx. 12-13 miles of the Stour Valley Path, so is another good way of seeing some of the route.