Are you an Unattached Runner? If you join your local club, not only do you save two pounds on your race entry fees,
you train with friends, you can get tips from more experienced runners,
you can run in races open only to club runners (local cross country leagues, road and off-road relays, Yorkshire veterans championships etc),
and you can put something back into the sport by helping at the club's races.
But if you don't want to join your local club, you could join the
realbuzzrunbritain.com Running Club