Bert's had some rough press over the years but, to give him credit, he was smart enough to publish a basic guitar tutor in time to exploit the huge demand created by the UK skiffle-boom. He's a solidly-trained reading orchestral guitarist who also played some lamentable solos on some of Britains' earliest so-called rock and roll records.
he had no feel for it, and I realised this even as a beginner; it was hard to take hime seriously when I was also listening to Chet and Hank Garland on the Everly's records, and James Burton with Ricky Nelson.
Here's what I had - not a guitar-tutor as such, but a book from which I learned about chord-construction and my very first steps in theory.
Here's a rather fuzzy scan of a picture showing Bert - I was going to say 'He's the one with the white hair..', then I checked out all the rest of us - the occasion was Lonnie Donegan's Memorial Service in May, '03.
Bert's thrid from the left in the back row....
I'm not going to say that Bert DIDN'T 'teach' Eric Clapton to play - if EC had wanted to execute 'Home On The Range', then he may very well have consulted 'Play In A Day'....