I've entered this too...did the Bungay Black Dog mara the week before Stratford/London, which was a testing course - quite hilly in places. But got a PB by 14 minutes and am now raring to go again!
Bungay also had a half but they started 2 hours after the full. So the first 15-16 miles were pretty quiet and then the fast halfers came storming past
I've done London twice and definitely preferred Bungay (although wouldn't knock London for atmosphere) - easy to get into your pace and well supported. I'm hoping RH will be somewhere in between the two.
I'm doing a 10 miler this weekend - nice to get back to a shorter race. Looking for a PB there as well as it is a flat course.
Rachie - I've had runners knee...my advice would be to work on your quads and glutes, try and strengthen them so that more of hte power comes from there and less strain on the knee. But I'm no expert!