It's all very well to say that ole Cec collected tunes in the time-honoured way from old blokes in workhouses (and what Anahata said about The Radstock Jig is absolutely true to the best of my knowledge), but it is nevertheless the case that vast quantities in The English Country Dance Book referred to by Dave (and to which I had already drawn the OP's attention to in the Folk Handbook thread) came from John Playford's 1651 English Dancing Master.

And the funniest thing about this publication was that it was a send-up because there were no 'English' dancing masters. They were all French. And the tunes were from everywhere, just have a look. All of which is as it should be. Tunes and dances have been incorporated into 'the English tradition' since time immemorial and it still happens. Possibly the most 'English' dance tunes today are the Dr Who theme and Blackadder. And the next will be whatever Glorystrokes are working on.