Repeating post no. 5 to help you find it!
Here is a summary of the correct answers so far. Points will be added later.
Chassis 1 3 litre Bentley, solved by Neilshouse
Chassis 2 Frazer Nash Le Mans Replica, solved by Tom_I
Chassis 3 Aston Martin International, solved by Neilshouse
Chassis 4 1938 Atalanta, solved by D-type
Chassis 5 1949 Bentley Mk VI , solved by D-type
Chassis 6 BMW 315, solved by Woodinsight
Chassis 7 1934 Bugatti Type 59, solved by D-type
Chassis 8 E-type ERA , solved by Neilshouse
Chassis 9 Lotus Elan, solved by: qwaszx
Chassis 10 1935 Trojan Mastra, solved by D-type
Chassis 11 Mercedes-Benz 300 SLR, solved by Neilshouse
Chassis 12 MG R-type, solved by Tom_I
Chassis 13 1929-1936 Rolls Royce Phantom II, solved by D-type
Chassis 14 1937 SS Jaguar 100 3.5 litre, solved by D-type
Chassis 15 Humber Pullman c1948, solved by Woodinsight
Chassis 16 1926 Morris Cowley, solved by D-type
Chassis 17 1938 Brough Superior V12, solved by D-type