In August 1931, two Bedford passenger chassis (the 14-seat WHB and 20-seat WLB) were announced. Duple had built early bodies on the WLB chassis for the Vauxhall Motors (the parent company of Bedford), and was listed in publicity material as one of the four bodybuilders recommended for the WLB chassis. As demand for the type rose, Duple's ability to produce in quantity set them apart from their competitors, and soon Duple-bodied Bedford WLBs were in service around the country. The association with Bedford was to last over 50 years.