Used to do the SAMS series years ago beleive its called something else now, which were the southern championship series.Elite,Masters,Vets,Grand Vets. Lots of clubs run there own events,used to be a few round bracknel in the forest, and at checkendon near reading.Both of these venues would be suitable for a starter. I think most of them include a sportsman type class,to get you started. As long as you can ride flat out over the rough for an hour and a half you ll be o.k. Of course there are endurance events as well. Stay away from the champ, stuff untill you are ready for it,it can get pretty rough.