As a bonus, they have some pretty tidy members. I followed one lycra-clad sylph on the bluebell run for a few miles last year before I realised she was pushing me to a 5 min pace and I had to collapse at the next water stop.
Have a look to see if they do a "Park run" near you. Usually on a Saturday morning about 9am for about 5km. I've done it a couple of times now where I live (not near you) but it pushes me because I hate the thought of having my 30 something ass whipped like a bitch, by a 13 year old girl who doesn't feel the need to break in to a sweat. (Has happened several times before).
I'm sure they're quite well spread around the country and free to join. You don't have to go every week - just when you feel like it.