Just came across this 1979 video clip on Reuben and his banjos, recorded by the BBC. The presenter seems a little patronising, but great to get a glimpse of the collection! I presume that the building in the video is the 'White House' mansion that Carol mentioned above?

https://twitter.com/BBCArchive/status/714407456814809088

Also found this 1992 article on his later gas cooker collection. It lists his age as 52, meaning that he'd be 77 now if he's still around.
'The Gas Museum' in London which housed some of his collection closed in 1998 and parts of it were taken on by the 'National Gas Museum Trust', so they might possibly have some further information on him?

http://www.independent.co.uk/money/a-cooker-to-match-your-cast-iron-bath-reuben-reubens-shows-john-windsor-his-unique-collection-which-1550924.html


I've only just discovered the chap through the BBC video, so am very grateful to have found this thread. Once again, Mudcat saves the day!