For an urban delivery vehicle, manoeuvrability and the automatic coupling were huge advantages and the Mechanical Horse, its variants, trailers and coupling system sold in record numbers.

However in 1968 the success came to an abrupt end. New UK Construction and Use legislation required all wheels on a tractor unit to be braked. With the front wheel having no brakes and Scammell failing to find an efficient and cost effective solution. The Mechanical Horse’s three-wheeled successors, the Scarab and Townsman ceased production.

The automatic coupling system faired a little better with its development which set standards for convenience and safety, the firm continued to sell kits to several other truck manufacturers.. They were fitted to a wide range of light, two-axle tractors around the world and many were in regular use until the end of the 1970s.

With the weight of loads increasing Scammell did try to develop a heavy-duty automatic coupling however the strength and reliability of the 5th wheel prevailed. As well as the trucks, Yards were also getting bigger reducing the need for small manoeuvrable delivery lorries.

Legislation and changes in practices saw Scammell’s dominance with the Mechanical Horse concept come to an end.