Hi Bertber, we are not in south devon but Tiverton Radio Control Car Club has a track in Wellington, Somerset. I think this is the only 10th off road track around the south west, correct me if mistaken. If you PM me about contacts. also the website is
http://www.trccc.co.uk/ and we also have a section on here
http://www.oople.com/forums/forumdisplay.php?f=98
The next race is the 14th March, 21 days time, we mainly only race 2wd, we do have a tarmac track which we race on the same day.
As for Marldon that is Torbay RAC,
http://www.torbayoffroadracing.co.uk/, they do mainly nitro/ electric 8th stuff,