[1] Due to statutory construction and use rules on maximum rear-overhang length, however, Leyland considered that the 0.600H engine of the Panther would not be a feasible fit in a shorter version.

The 0.400H, alongside running units from the Leyland Tiger Cub such as the pneumocyclic gearbox, brakes, axles and rear steel-leaf springs, were used instead.

[4] The first Panther Cub, built with a Park Royal body and destined for Manchester Corporation, was shown at the 1964 Commercial Motor Show at the Earls Court Exhibition Centre.

The most important of which was a share-exchange in January 1965 between the Department of Transport and Leyland Motor Corporation, this resulted in the Transport Holding Company owning 30% shares in Park Royal Vehicles and Charles H Roe, and Leyland Motor Corporation owning 25% of Bristol Commercial Vehicles and Eastern Coach Works, this removed Bristol chassis and ECW bodies from the sales restrictions that had applied from 1948.

The only 10m long rear-engined single decker chassis to sell better than the RESL in the UK, because of large London Transport orders, was the short-wheelbase AEC Swift, which shared the same frame as the Panther Cub.

The closest alternative in the Leyland Motor Corporation catalogue was the Park Royal-bodied Albion Viking but that only sold six of a planned sixteen.