As mentioned at the Kent meet last night, here are details of the Bucket & Spade run:
http://rommcc.org.uk/bucket%20and%20spade%20run.html
I think you have to carry a plastic bucket & spade (as used on the beach for sandcastles!)
I don't know if our cars qualify, so I will e-mail the ROMMCC and let you know
Cheers
Al