There was supposed to be regular buggy racing but it hasn't really taken off due to a lack of demand from what I gather. I think there has only been 2 or 3 buggy meetings this year...
It might take off again - you'll find info on the forums below:
http://colchestermodelcarclub.myfastforum.org/
http://lawfordbuggyclub.myfastforum.org/
Locally there is also Coastal MCC at Ipswich & Mid Essex (MERCC) at Gt Braxted at bit further down the A12.