Mystery solved!

I have now discovered that it was Shirley Bray from the South Molton Local History Society who very kindly sent me the photocopy of the 1922 invoice from Edwin 'boss' Cruwys. Shirley found the invoice in a drawer at the South Molton Museum. She did e-mail me to let me know it was on the way but unfortunately the e-mail was sent at a time when most of the Tiscali e-mails were being blocked and her original e-mail did not reach me. I'm delighted that the mystery has now been solved.