Bert Weedon

[twm]

I've never met Bert Weedon but he is apparently the great uncle of one of my daughters-in-law:-

http://www.npr.org/blogs/therecord/2012/04/23/151221834/remembering-bert-weedon-guitar-teacher-to-rock-stars-and-many-more

There's a passing of mention of Mark in the text.