We had an ex-RAF Nav here in NZ around the time we bought the 10 Andovers ex-RAF. He was most definitely a Nav, and had practiced on Canberras of various squadrons he assured us, [our Canberras had long gone at that time]. He was on my Command and Staff Course in 1976 and in the course of discussion over a beer revealed that he had taken part in one of the Canberra raids during the Suez crisis. There followed a noticeable silence and a change in subject because he knew and I knew that, given his age, he would have been the only 16-year-old Canberra Navigator on Suez operations!