This photo is headed:-
The Mk VII at its launch. Works drivers, Stuart Lewis-Evans and Les Leston with Charlie and John Cooper appear to be interested in some cockpit detail. Note the enclosed bodywork above the engine which was quickly removed to improve cooling and access.
The web site address is:- http://www.500race.org/Marques/Cooper%20Mk%20VIII.htm

Hope its of interest, the cross over for me is that to be competative you had to run OHC Norton engines, an earlier version of which powers my 1936 Norton International.
Pete