Did the RAF riders have green or blue-grey DR-helmets?
I've seen a lot of blue-grey RAF tin-helmets, but the only so painted DR-helmet i've seen was pictured in an article published on the forum a while back called "DR-blues", about a M20, Indian and Hillman, and in the picture the two riders are wearing RAF kit, and one green and one blue-grey DR-helemet...
And hard to tell on the old B/W pictures :)