I've shown previously photographs of Formula 3 cars of the 1950s, and here are some more, this time cars that took part in the HSCC Summer Race Meeting at Oulton Park in July 1992.
This is the 1955 Cooper Mk9 of John Turner
Here's the 1951 JBS of Richard Utley. The JBS was developed by James Bottoms & Sons from the Cowlan Special of R L Coward and Geoff Lang
.The 1952 Kieft of Rod Delves
This car is described in the programme of the event as B R Banyard-Smith's 1955 Cooper MkIV, but the MkIV was a 1950 model, and this looks more like the MkIX of 1955.
The website of the 500 Owners Association gives lots of information about the cars that took part in Formula 3 racing in the 1950s. Just click on 'Marques' in the list on the left-hand side of the 'Home' page.