Tour the villages around Brands Hatch, Ivy Hatch is a good place to start. Or take the ferry to Calais, drive up to Bruges. Can be done in a day - I have, several times.
Thanks for the idea. If there is a break in the clouds, it is the 7 otherwise the Elise if it is likely to rain. The Caterham is no fun when it is hammering it down..