I had to look into that ,
I knew nothing about that plane but are you referring to the offset , raised canopy permutation ?
I found this :
"
the B(I).8, with a redesigned nose solving the visibility issue by giving the pilot a raised seating position and a fighter-style canopy, albeit offset to the left, with the navigator buried in the fuselage alongside. "Buried" was about right, as the reduced space available meant there was no room for the navigator to have an ejection seat - instead they wore a chest parachute and were expected to be try and abandon the aircraft in a hurry through the normal entrance door. "
From :
https://www.thunder-and-lightnings.co.uk/canberra/history.php
I'm not fully coffeeated yet
, so I need to do some more coffee drinking and reading .