I am really enjoying and appreciating TS4 even if it's not quite as good as series 1 to 3. I think it's having the kit drummer which spoils it.
As ever, though, it all seems to reinforce the general view that traditional music is something which happens in Scotland, Ireland and America but not England. I don't wish to belittle the Celtic influence, but there is also a vast commonality between English and American music and song.