Held in the 1920's and 1930's the Colwyn Speed Trials were held on the Western Promenade at Colwyn Bay.

Colwyn Speed Trials 1924
Colwyn Speed Trials 1925
Colwyn Speed Trials 1927

Held in the 1920's and 1930's the races were held on the beach at Southport.

Southport 100-mile race 1920-1929
Sand race at Southport 1932
Sand race at Southport 1934

1939 RAC regulations!

1939 RAC General Competition Regulations
1939 RAC Regulations Appendix
1939 Royal Automobile Club Rules & By-Laws