It's a 1959 Cooper-Climax T51 and the book 'Great Racing Cars of the Donington Collection has this note about it:
The works cars of Brabham and Salvadori began
running 2.2-litre Climax engines and Leonard Lee of the Coventry company
authorized development of full 2½-litre units for 1959. With 2,495cc, and
240bhp the Cooper-Climax T51s were on a power-to-weight par with the
front-engined opposition, and Jack Brabham and Bruce McLaren – his youthful New
Zealand team-mate – proved them totally competitive. Brabham won the
Monaco and British GPs, and when his car ran out of fuel while leading the
United States GP at Sebring, McLaren took over to score a victory which assured
Brabham and Cooper-Climax of the World Championship titles.
There’s also this note about
the T51 in the Donington Collection:
Cooper-Climax T51
Chassis unnumbered –
Collection property – believe to be works No. 2 car, as driven by Bruce McLaren
in 1959. To Collection from the late Jo Siffert’s collection of racing cars,
Fribourg, Switzerland.





.jpg)

