I'm not sure if any of the original writers on this thread will see this almost 10 years later... but David Hillery is my beloved grandpa! I've just come across this thread when looking for his PHD thesis online, and it's been so lovely reading through the comments to see how his music has been celebrated over the years. Grandpa ensured that traditional folk music was a big part of my childhood, some of my fondest memories of being little are watching him play the concertina and listening to his rich voice sing the familiar tunes.
You can find his music on Spotify, he's also on the album 'Trip to Harrogate'. My childhood favourite was his performance of The Musical Society on that album- I still adore it today :)

Grandpa turned 90 last July and we had a wonderful party with lots of music of course! He still plays and sings and has recently taught himself to play the banjo which I think is super cool and amazing.

I'll be sure to show him this thread if he hasn't seen it already, the internet can be a lovely place sometimes...