 It was developed from the Leyland Tiger Cub, one of the most important changes being the introduction of the larger and more powerful O.600 engine (later-built Leopards were fitted with the 11.1-litre O.680 engine).The Leopard was superseded by the Leyland Tiger.The original 30 ft bus version was coded L1, it was right hand drive with a 16 ft 2in wheelbase and an overall length of 29 ft 4in.