Thank you all for the kind comments and help. I have genuinely found it all interesting and helpful. The Harry Cox film was one song from Peter Kennedy's film included on the Folk on the BBC broadcast on BBC 4.It includes Carthy MaColl Bob Davenport and Davy Graham.
Tim Radford has a lot to offer as well. Take a listen to his recording 'George Blakes Legacy'
Just one final remark. Martin Carthy encouraged me to sight read music-I mean sing from the page. The best thing I ever did. I found it more than difficult. Martin suggested imagining the notes on the Guitar as a help to getting started. I can do it fairly well now, and I would reccommend it to any singer who wants to unlock all those songs tucked away in books and on websites. Not that my wife is wildly pleased. She says she remembers when we went to bed as a new married couple, now days I climb into bed with a book of traditional songs and lie there whistling!
I have already started with some of the techniques above so thank you for your support
Nick