From the FRA website:
FOR MEMBERS
THE FELL RUNNERS ASSOCIATION
The Fell Runners Association was formed in 1970 to cater for the needs of fell runners. It has over 9,000 individual Members from around 300 athletic clubs. The Association (which is affiliated to UK Athletics) acts as the Governing Body for the sport of fell running in England.
Fell running has a relaxed low-key atmosphere where friendships are easy to make on the hills that are there to be enjoyed. There's something for just about everybody, whether it is the thrill at the sharp end, the pleasure of taking exercise amongst the hills, or the solitude of the lone long distance runner.