Hi Paul,
Can't find any other thread relating to this one either but have entered as it appealed to me (with being local) and because I have not ran it before. I am hoping for completing in an hour. I am also new to running one of the 'Bupa Great . . . Run' so hope to have an enjoyable day out as I know they are reknowned for being extremely popular events bringing in the crowds for support, which I feel is a welcome bonus.
As for the weather, fingers crossed . . . but at least can rest assured it will be an improvement on the current conditions !! 
Anyone else doing this one . . . ?
Nick