Brabham BT35

This car competed in the Historic Formula Racing Cars race at the HSCC's Summer Race Meeting at Oulton Park in July 1995.

It's Lincoln Small's 1971 Brabham BT35, shown in the programme of the event as having a 1600cc engine, so presumably it's a BT35C Formula 3 car.

Here's Lincoln Small during the race at Deer Leap, and you can see how much the track here drops down after Lodge Corner.