there is Silverstone (tuesday night) and Junction 16 (friday night) up the M1 from you. but they only do saturday meetings once a month in the winter.
also there is Herts nitro on their electric track (summer tuesday nights) and stotfold (summer wednesday night and most sundays) a bit further east.
of if you head south, come and join us at DMS thursday nights in watford. we have a saturday winter series too.
www.dmsresults.co.uk