In 1961 the maximum length of single-deckers was increased to 36 feet. Bristol Commercial Vehicles and Eastern Coach Works designed their first rear-engined single-decker to take advantage of this new length. Two prototypes were built and tested in service in 1962. United Automobile Services had the RELL version with a low chassis frame for bus work. South Midland had the RELH version with a high frame for coach work. Production started in 1963, with...