I was privalidged to go round the W&S works a year or so before they closed.
A very knowledgable gentleman named Pat Whattley took us round. I have a feeling he has written a definative book on W&S and may hold the records. I'm afraid i don't have a contact for him but the Bhm prooof house may have contact details. Alternativly Jon Hay of the Bhm gun museum might be able to help.
jhay@birminghamgunmuseum.com
JOhn