Back in the early 60s as a schoolboy I went into the ASF hangar at Laarbruch, with my father who was OCASF, and saw a Canberra with the canopy painted white on top. This was presumably to reduce solar glare when flying at height. My father suggested that I ought not to have seen this aircraft and not to mention it. I have always wondered what it was and which sqn operated it, presumably not 540 which had disbanded by then. Can anybody enlighten me?