Sorry ... it's a long time since this thread started but I'd second your request for details of a riding club.
I'm 15 miles up the A685 from you and I'd also like people to ride with but didn't start learning until I retired (early) so am likely to be too old and too much of a beginner to be the slightest use as a riding 'companion'. This is really not an exaggeration and it would be no pleasure to ride with me at all because you'd probably hardly ever even get into trot ... and certainly not canter. Absolutely no modesty here - just plain fact.
It would be great though if a few of the folk who live in the Eden Valley (or nearby) could get together to start a riding club.