If you want to get some of the facts about A L Lloyd, you can go to any of the histories of folk revival, like Georgina Boyes' "The Imagined Village" and Mike Brocken's "The British Folk Revival". These will give you a lot of the dates, the links with the Workers' Music Association and Topic, etc. But be warned that they often come from particular ideological standpoints and are not always flattering to the man. You just have to take what you can from these things and work out where your own opinions lie. Also, there was a book edited by Ian Russell, called "Singer, Song and Scholar", which contained some very good articles on Lloyd.