An uncle in Canada who was doing well as a portrait photographer gave young Yousuf a job and a cheap camera of the time called a BoxBrownie (with which he won a prize).
Sitting at the long leather bar listening to Ella, sipping a "Box Brownie" (liqueur-infused strawberries swimming in champagne) and being lured in by Donovan's photographic stable of ingenues just might provide your perfect London moment.