Gavo - i was also thinking of Paddock Wood, as it's only down the road from me, and as you say it is supposed to be nice and flat. It's also at an ideal time in preparation for the FLM - for those lucky enough to get in (i'm hoping).
There's also the Tun Wells 1/2m which i think is in February, which i am also targeting, although it's a pretty tough course.