Aha. Thanks for the leads.
From the above-cited site:
The Webley-Fosbery also makes an appearance in the motion picture Zardoz, where it is used by Sean Connery's character "Zed". The two-handed method of manually cocking the revolver can be seen several times in the film. As a movie prop firing blanks and not live ammunition, the absence of adequate recoil would not allow for automatic recoil cocking.
I guess that was one of those cases where marketing overrode engineering. Less than 5000 built, jammed a lot in service, according to Wiki.
An early example, perhaps, of the "Why not go with the latest and greatest technology?" syndrome so common nowadays.
If there's a bell, we must ring it. If there's a whistle, we must blow it.
Terry, 230RN
Image source:
Source:http://www.adamsguns.com/
"You are welcome to copy images from my site - Please give credit if you use it online. If you publish an image from my site - You must give credit."
Early Webley-Fosbery .455 Automatic Revolver serial No 689.