At the HSCC Summer Race Meeting at Oulton Park in July 1992 there was a race for three classes of single seater racing cars, one of which was for 'Racing Cars under 1600cc with Wings'. This car was entered for the race in that class.
It's Michael Schryver's 1971 Lotus 69. The Lotus 69 was designed to be used in Formula 2, Formula 3 and Formula Ford racing - this car had a 1600cc engine and looks to have been designed for Fomula 2 racing. The Lotus 69 was also used in Formula B racing in the United States, and this website details one such car.