Christopher J Bellett
Since my original email I have been looking at the photograph in more detail and I am not convinced it is Helston. I have some diagrams of the layout and interlocking of both the original lever frame and of the replacement installed in 1958 and they do not tie up with the photograph. There are 10 working levers before the space at the left hand end but Helston only ever had 8 working levers at that end. It’s not Nancegollan, Praze Ground Frame nor Gwinear Road either.
Sorry to muddy the waters.
Kind Regards, Christopher J Bellett