A posting on Facebook today led me to a collection of 49 black and white photos taken of children and conductors at the Peto Institute.
http://stuartfreedman.photoshelter.com/gallery-slideshow/G00007BLxf9u_EGI/?start=
These are not dated but look to me like they were probably taken in the 1990s, and how they came to be taken is not stated.
The photographer, Stuart Freedman, started taking photos professionally in 1991 and is now a celebrated photographer worldwide covering a wide variety of topics and events.
http://archive.stuartfreedman.com/about/