Sarah - well done (again)! Great race reports. If that York uni student is running in October you can have your revenge 
On the smaller vs larger field/crowd front I much prefer the smaller races. I like to drift off into a world of my own when I do my long runs (I am not a mentalist, I just like to daydream) and in London I couldn't do that because of the sheer noise.
I agree with Angela, it's so nice to be able to run your own race without feeling impeded. For the Welsh marathon it was also great to be able to chat to people on the way round. You can of course do this in the larger races but I find it harder - not sure why. Maybe because of the noise, maybe because you're all bunched up and constantly looking out for gaps or bottles and uneven ground.
Got a couple of sanity runs in this week. Left arch is moaning - think it may have all tightened up a bit after resting. Need to get my rubber ball out.
Right, back to the grindstone...