I have just been informed about a series of 4 training rides being run by the Leics and Rutland group of EGB. The series is open to Pony Clubbers, EGB members and non-members alike; and is designed to take riders through from complete beginners right up to tackling a 33km ride at competition speed.
There will be plenty of assistance along the way and training in managing your horse and planning your ride as well as the practice rides themselves.
If you are new to the sport the this could be exactly what you are looking for.