Got a Green from the Tower at RAF Colerne many years ago arriving non radio, a short while before their official opening time, in my 65h.p. Nord NC854S.
So happily landed forthwith. To get a b**llocking as they'd not shone me a Green
It turned out it was the Sun shining off glass top tables through their green tinted Tower glazing. So I was half forgiven.
mike hallam