They're four cars that took part in the Ron Flockhart Memorial Trophy race, and from the nearest car they are:No. 5 David White 1953 Cooper Bristol Mk2 T23
No. 39 Patrick Walker 1953 Cooper Bristol - converted in 1973 from T25 Sports Car
No. 47 Nigel Bancroft 1953 Cooper Bristol Mk2 T23
No. 8 Geoffrey O'Connell 1953 Cooper Bristol Mk2 T23
Five other Cooper Bristols took part in this race.
On 8 September 2016 I showed a photograph of several cars in the paddock with this line of Cooper Bristols in the background.