I took this photograph at the Historic Grand Prix Cars Association's Donington International Grand Prix meeting in May 2004.
Both cars belong to Anthony Ditheridge, and number 20 is a 1959 Cooper Monaco T49 which the programme of the event says has a 1960cc engine. The car was named the 'Monaco' by Charles and John Cooper after Jack Brabham's victory in the 1959 Monaco Grand Prix. Car number 8 is a 1958 Cooper T45, also with a 1960cc engine according to the programme. The T45 was developed for Formula 2 racing and it would have originally had a 1½ litre engine.