"Nowt wrong with that, as others have said, but what was Bert and what was collected?"

We may never know. When we were at Glasson Maratime Festival, my partner was telling me about a particular song (I wish I could remember which one!) about a mining disaster. Bert Lloyd claimed the song had been written locally, but when, years later, the local paper was written to (it may have been by Roy Palmer) to see if the author could be traced, no one in the area even knew the song. Pretty convincing evidence of it having been written by Bert himself. That sort of evidence - trails going cold on particular songs - may be the best evidence there will ever be.