Hi Foss
Tyro Trials are Designed for shiny motors or novice drivers, you can enter these at the age of 13 and keep going until you get bored.
If you have a full Road licence you can enter the RTV, this is a step up from Tyro, with harder climbs and side slopes it makes the days driving that bit more adventurous, all you need to have for an RTV normally are a set of decent off road tyres, a fire extinguisher and a tow rope, also it helps if you don't mind a bit of scratching on the bodywork as some people setting out like to send you into bushes.
Cheers
Callum