There are plenty of types of motorsport that you can take part in with a standard modern or classic car. All you need is a Motor Sport UK Clubman’s licence which is free and can be issued online. These types of event are known as StreetCar.
The most popular are autotests. Autotests are where you have follow the correct route around a set of cones laid out in a field or car park, following a defined route given to you on a card.
You are timed to the second and there are penalties for not taking the correct route, or for hitting the cones. Several tests are run during the day and the winner is the driver with the lowest total score at the end of the event. You can start doing production car autotests (PCA) when you are 14.