In 1957, Sydney Guy retired after 43 years with the company. Guy continued to develop new and very successful models of chassis, introducing updated versions of the Otter and Warrior models and the high performance Victory chassis. However, an ill-advised decision to take South African sales in-house, which involved leasing the vehicles, rather than outright sales, proved an extreme strain on the company's finances, as there were many defaulting contracts. This, combined with their new double-decker chassis, the Wulfrunian, would prove highly damaging for Guy's future. Launched in 1958, the Wulfrunian included many innovations in its design, but, crucially, lacked the thorough testing necessary before marketing it, resulting in poor reliability upon which Guy had built its name.