idk..
did you find the Flaxey Green map? It has some phone numbers. But not just instrumental sessions.

https://goo.gl/maps/bKtKJ3dZwSL2
If you can, open it in a browser tab, landscape.


Or something FB pages where you could ask too
https://m.facebook.com/search/groups/?q=folk%20music%20devon&source=filter&isTrending=0&tsid=0.8039503518208693