And Carnut has it! It's the W & G Model L, made by W & G du Cros Ltd of Acton, West London.
William and George du Cros were sons of William Harvey du Cros, who among other things was a founder of the Dunlop Rubber Company.
W & G ran taxis and delivery vans before WW1, making a lot of their own bodies. They made trucks and buses after WW1, then slowly disappeared, almost without trace. Though rarely mentioned , it was one of the companies that made up the Sunbeam-Talbot-Darracq conglomerate, and was disposed of just before that group went into liquidation in 1936, by which time production had dwindled.
This advert is from 1926.
