Most M20s used in military service were hand painted and painted regularly, I don't think I can ever recall a M20 tarted up like they do now with a spray finish mat UN green, in all my nine years service, don't forget these were in service right up to the seventies, I think the only ones bulled up were the ones at Hide Park, 20 car coy RASC and RCT after 1965, The colour was bronze green. HTH
TTJohn