There appear to be some prototypes in that listing. The post WWII VN, Van Neck, Press cameras for instance, and an SLR.
In the last big collection I saw for sale many items sold for less than the estimate, that was maybe just before Covid. However, the cameras were more common, nothing unusual and no prototypes.
After WWI Peeling & Van Neck took over the C.P. Goerz, London factory which had been set up in 1899 to make cameras, and lenses. They continued by making The All British Anschutz camera, later called the Van Neck Press camera after Goerz merged into Zeiss Ikon.
Under the "Trading with the Enemy Act" 1914 German products could not be sold in Britain & the Empire. A 1916 amendment allow the Government to sell off seized stock. Peeling had worked for Goerz before the war, but the KUK limited company was wound up in 1917,
Peeling & Van Neck were Goerz agents after WWI from 1923 to 27, then Voigtlander, as well as Deckel & Gautier shutters. But the partnership split up during WWII, as imports from Germany ceased.
After the war Peeling & Komlosy were the Zeis & Zeiss Ikon importer. There were all the Van Neck prototypes in that collection - 5/
And then 2 Nilrod cameras, these were made by Williamson, who made aerial cameras, they were sold by Dawes Instruments for a very short time. But BJP Almanacs show other very short livid cameras.
So who was Jim Barron, 1927-2002 ? That becomes interesting as he was a photographer and cinematographer who worked for the civil service, often in the field of overseas aid. Then you find 4 of his images held by the National Portrait Gallery, photographing musicians, including a very young Pete Townsend in the early 1960s.
Then you ask how did he acquire Prototypes, but post WWII UK manufacturers were after lucrative Government contracts & investment, so who knows, someone in the Civil Service had to evaluate cameras . . . . . . . . . .
Ian