Danny ...
I think you are referring to the early 'Blue' (seen here on the right) ... I believe the 'Grey' (seen on the left) superseded the 'Blue' ... but I could be wrong. No doubt one of our Suqipper members will correct me
Not a velcro strip in sight ... and you weren't properly dressed unless you wore a tie
Image Credit : Crown, MOD, RAF, IWM
PS. That's a proper Flight Line
