Share 'Request for information: Cyril M. Bernard (20th c photographer)'

Hello, I'm looking for information about a photographer called Cyril M. Bernard (see attached stamp), so I can contact him, or the current rights holder of this photo, to ask for permission to reproduce it (I'm a historian currently preparing a book manuscript). He was working around London in the 1950s and 60s, but I haven't yet been able to find any information that would help me to trace him o…