P.S. I'm sure he features variously in BSA literature of that period, which would give a more comprehensive insight into his involvement(s). Articles by Les Salmon would be the best place to look.
By the way - and only mentioning in case you're labelling anything - by Anniversary Chamber, do you mean the section of cave beyond Moss Chamber? If so I think it's properly named "Anniversary Hall". This is maybe another reason to check original exploration accounts in BSA material.