Greg wrote: 'the "tradition" lasted long enough enough to overlap and interbreed with the "revival". Ot at least, that happened in the north. I can't really speak for what happened in the south.'
This certainly happened in the West Country - Putting the square dance revival of the 50s side by side whith thier own extant traditions, the likes of Charlie Bate and Bob Cann developed the tradition. Add that to the Cornish choir tradition(where would we be without the Methodists)and the repertoires of people like Charlie Hill, - and when the 60s song revival came along, the tradition said "O.K., well done kids, we'll have some of that, you can be adsorbed as well."