Hi,
the nearest lsor club to you would be Nene Vally Raceway,
http://www.nenevalleyraceway.co.uk/
there is also KORT if you get over that way,
http://www.kernowoffroadtrack.co.uk/Racedates.html
further north is NDOR,
http://www.ndor.co.uk/
All good friendly clubs.
BR,
Simon.