Unfortunately, I'm not able to take any more photos because the revolver isn't with me at the moment.

So, I only have one more question right now: has anyone ever got any information from the Arms Research people at this link:

Wilkinson Sword research, Webley original factory records archive ?

To be honest, it isn't 100% clear to me how the process works, but they seem to say if they can't find any information on your particular serial number, you don't get charged. That sounds ok to me, but, as I say, this isn't 100% clear.