Nice theory guys, but unlikely to be true. Peter Robinson was the sales manager of Dartington Glass, and is still around! He spoke at the celebrations of 40 years at Great Torrington last year with Eve Scanlon, nee Thrower.
Eve may have his contact details.
"Smith & Jones " was a popular TV show with Mel Smith and Gryff Rhys-Jones.
Peter is mentioned several times in Mark Hill's excelelnt tribute "Frank Thrower & Dartington Glass" by Mark & Eve, pub, by Mark Hill Publishing!