Thanks to all who responded to my query with saved copies of the Masi/Medici saga. Much appreciated.
Of course, I am still, and always will be seeking as much information as I can about A.S.Gillott and Ron Cooper.
Thanks to (Free) Ken Denny, Richards Sachs, and John Alden for the information they've provided me thus far.
So far, I've managed to get my hands on a 1964 Cycling featuring Gillott's and Ron, article (courtesy the CR website), a 1970 Cycling article celebrating the opening of Ron's shop (courtesy e-RICHIE), a Gillott's history (courtesy Ken Denny), and a 1979 interview with Ron Cooper (courtesy John Alden).
Any further information anyone can provide will be immensely appreciated.