The Link works and thanks very much for your info.
This is one possible solution to consider but in the context that these icons were created made me wonder if they are old style Continental? This is why I posted it in this particular forum where we have access to information about Railway Systems from around the World other than British.
However, having said that, some modellers do like to recreate Signal Box Diagrams, in exact detail, on their Control Panels so this could well have been an attempt to recreate a set of signal icons for this specific purpose.
If this is the case, is a full set used? Where can I get information about them from, please?
Allowing for "Murphy's Law" - someone, sometime will no doubt ask for a set of icons to be created. DOH!!!