I believe the answer about the Canberra. The Sea Vixen comment sounds reasonable too - and perhaps the difference between that and others is that the U.K. considered them all-weather fighters whereas things like Skyknights, Vautour IINs and Yak-25s were night fighters and the problem did not arise. The Javelin prototype had a metal rear canopy, but presumably display brightness improved and the later versions had clear hoods. The Sea Vixen was harder to change, but later versions had a perspex panel in the coal-hole hatch.
Last edited by LowObservable; 21st Jul 2013 at 17:54.