There are source singers still coming to the surface
The wonderful John Greaves from North Yorkshire who has been about for years and until recently had not been recorded
I can now say that Steve Gradham has recorded him for our Yorkshire Garland Web site project
I was also very fortunate to record a lady in Huddersfield very recently ~ who has never been in a folk club!
It is amazing what is still out there and Brian Dawson in the wilds of Lincolnshire simply goes out singing and playing his accordion and taking local songs back to the community and hence people continue to give him songs/leads etc