1958 BRM P25

Two BRM P25's were entered in the Historic Car Championship race at the Aston Martin Owners' Club's meeting at Oulton Park in September 1986, and this one was entered and driven by the Hon. Amschel Rothschild.

Although universally known as the BRM P25, I've found this information in a Bonhams description of the car when it came up for auction in 2007:

BRM’s in-period Project 25 classification covered the engine design alone, the spaceframe chassis structure comprising Project 27. While this Lot offers the eighth of the team’s 2½-litre 4-cylinder Type 25s to be built, this car was the third to use the `1958 spaceframe Project 27 chassis in place of an original semi-monocoque design which had been used for the preceding five cars. Those semi-monocoque BRM Type 25s built from 1955 to 1957 are recorded within the team archive as cars ‘251’ to ‘255’. The subsequent six pure spaceframe cars built 1958-1959 were then referred to as ‘256’ to ‘2511’, even though their Project 27 chassis frames were numbered in sequence ‘27/1’ to ‘27/6’. Hence, this car was referred to in contemporary BRM team records – which survive today – as ‘258’, while its specific chassis frame stamping reads – again perfectly correctly – ‘27/3’.

The P25 was said to be the fastest of the 1954-1960 Formula 1 era, partly due to the oversquare (102.87 mm bore x 74.93 mm stroke) engine allowing for larger valves to be fitted. The car was plagued with reliability problems, however, and the only Grand Prix win was Jo Bonnier's victory in the 1959 Dutch Grand Prix in this car, chassis 258.

Here's the car rounding Lodge Corner during the race.