Squadron colours for the taxi are a bit of a conundrum if the date I've been quoted for the photo is correct. Of the squadrons [71, 73, 85, 87, 249, and 306] stationed at Church Fenton during the Battle of Britain period the only one with chequer board colours was 85. Now their colours were red and black which doesn't look credible on the taxi photo, even allowing for orthochromatic film.
If we ignore the claimed location then it's possible the taxi could belong to 19 Squadron whose colours are white and pale blue. Fortunately they were very active during the Bob show so the camouflaged taxi with flashes would still fit the picture.
Lastly an idea for a diorama that I came across in my 85 squadron file.