It's impossible to believe that such great photos can have been sleeping for over 50 years in a box of Kodak slides and still come out looking so pristine. Not just that but with a very specific look that anyone with an Instagram account would probably love to capture. As it turns out this is no accident. The photos were shot on a Corfield 35mm which I'm informed was a good camera in the 1960s, having a periscope which lowered in front of the focal plane shutter and which provided a split image focussing arrangement. A big advance upon the standard range-finder camera of the day.
The Yimkin photos in 1961 were taken on a Periflex Gold Star on Kodak and Ilford film stock and are a great tribute to Sir Kenneth Corfield who sadly passed away in February. Please see the Telegraph obituary here for more details.