As a bright-eyed, bushy-tailed trainee librarian in the late 1970s, I discovered The History and Practice of the Political Police in Britain by Tony Bunyan while shelving books in Reading University library. It gave me a lasting healthy cynicism about the British system.
Later, Tony and I were members of the European Information Association, spreading information about the EU. They say you should never meet your heroes, but Tony was shy, unassuming and unfailingly complimentary about the information service that I edited.