Hi Milan I wonder if the 1966 race you refer to where Coppins had the Anglia could have been in late 1966, but during the 1967 season. Coppins raced the Zephyr during the 1965 season painted white as part of the Molyslip team, then painted red in the 1966 season.
Then he and John Ward purchased the breadvan Anglia raced by Paul Fahey during the 1966 season, repainted it red and raced it during the 1967 season.
So maybe the Renwick round of the 1967 season was held in late 1966?