Being able to get back is important, too. There's a 200 from Tewkesbury I was considering. Getting there by train (Ashchurch) is quite peasible from Brizzle without a ridiculously early start - but there's no train that gets back without waiting several hours at Glos and arriving about ten the next morning! So in effect you have to either have your own transport, be willing and able to ECE or be committed enough to pay for a hotel just to go for a bike ride.