Another example of a Chilton VOELCB
Cosmetically it is substantially identical other than the wording which states 'Ottermill Chilton Limited' rather than 'Chilton Electric Products'. The 'Push To Test' wording has moved from the button itself to the grey plastic just below the button.
Presumably whoever purchased it either couldn't be bothered to return it, or just forgot about it.
There is a single set of E and F connections, which are at the top. The lower set were presumably omitted to reduce the manufacturing cost.
Terminal covers here are black, compared to grey on the older model.
The panel here is loose, although it is likely that it was originally glued in place, as there would be no reason for anyone to access the screws inside.
This video shows the internal mechanism of the Ottermill Chilton VOELCB.