To Oleg and Luthier.
In all the screenshots so far, the RAF planes have had the 24 inches wide by 27 inches tall finflash. This was first introduced in August 1940, but was not universal throughout Fighter Command before December 1940 (the squadrons presumably having more pressing issues than repainting markings).
An order for tail-markings for RAF planes was issued in May. It specified tricolour markings in RAF paint colours, red forward, and stated that they should "cover as much of the fin area as possible". Thus, a number of versions appeared. These are all taken from photos of Hurricanes in 1940:
"Full" tails:
"Cropped" tails:
Finflash:
RAF flew with the various "full" and "cropped" tail markings all through the Channel clashes in summer 1940, by late September/early October perhaps half of the squadrons had changed, and some stragglers flew with them even into early 1941.
Do you plan to have a look at this rather amazing variety of tail markings? If so, I have started collecting data on what squadron had what tail markings, and when they changed over to the regulation flash.