I think I'm right in that there never was a fatal real asymmetric Canberra accident.
I know of at least two - 3 Sqdn B(I)8 at Akrotiri December 1970 (crew and 1 passenger killed)and 98 Sqdn E15 at Cottesmore during 1971 (crew ejected safely).
Your comment may be true for the Meteor which suffered a similar problem.
Polecat