"An all-English lineup, singing all-English songs", proposes Working Radiush. So, OK in principle. In practise, would someone just care to draw up a list of all-English folk songs we could choose from? Who is going to decide? A special committee? Do we permit Irish origin songs, if well-acclimatised in England? Etc etc. I think anybody who has given any serious thought to this matter has recognised the impossibilty of defining a concept like "all-English" song: or at least in the context of traditional song it is impossible. "Popular in England", sure, but I think some people are looking for a more Englishy Englishness than that.A very elusive quality.
So, if anyone can supply the list, I'm up for playing in the concert!