This car is listed as the 2nd reserve entry in the Champagne Charles Heidsieck Sports Car Race in the programme of the Coys International Historic Festival meeting at Silverstone in July 1993.
It's the 1955 Lotus Mk X of Jeremy Agace, identical to the Mk VIII but which used the 1,971cc Bristol engine in place of the smaller capacity Ford, MG and Coventry Climax engines typically used by the Mk VIII. The Mk X has a hump in the bonnet to accommodate the taller Bristol engine.
On 13 May 2015 I showed a photograph of this car that I had taken at Donington Park in 2004.