The programme 'Final Ascent: The Legend of Hamish MacInnes' aired on BBC Scotland last night, and is now available on the BBC iPlayer - see https://www.bbc.co.uk/programmes/m000hp3m
I found it very interesting on a number of different levels. One thing he mentions is that the karabiner which failed and which led to the death of Tom Patey on The Maiden sea stack, was a known-faulty one which MacInnes had previously given to Patey as part of a belt to keep his trousers up, along with the strict warning that it wasn't to be used for climbing at all.