As its name so aptly suggested, Formula Junior was the main 'feeder' racing class for Formula 1 and other more senior forms of motor sport in the early 1960s.

Lotus's first foray into this hotly contested series was with the Type 18, a highly versatile mid-engined design - the company's first - that could accommodate a wide variety of engines and saw service in both Formula 1 and Formula 2.

In 1961 the Type 18 was replaced by another tubular spaceframe design, the Type 20, although, method of chassis construction apart, the two cars could not have been more different.

For this new, more streamlined car, Lotus boss Colin Chapman adopted a semi-reclining driving position, a move that enabled him both to lower the car's centre of gravity and greatly reduce its frontal area, while the provision of disc brakes all round (inboard at the rear) represented another significant step forward.

Announced, as usual, at the London Racing Car Show, the successor Formula Junior car - the Type 22 – ...