Delving deeper into this subject I have found an article written by Anandeep Pannu concerning the Canberra Marks T.4 and T.13 in which he mentions the problems regarding the ejection seats on the early Mk T.4 the following is an extract:-
"The trainer version dubbed the T MK 4 first flew on 12 June 1952 and entered service in August 1953. It was a “minimal change” derivative of the Canberra B.2 bomber; the most noticeable visual difference was the T 4 had a solid nose instead of the glass nose of the B.2. Two pilots on ejection seats sat in the front fuselage, which was designed so that the layout of the B Mk 2 was preserved. This resulted in rather cramped accommodations for both pilots! The left hand side was, essentially, a B.2 – the pupil having been moved a little to the left of the B.2 seating position. The instructor was given a sliding and swiveling ejection seat, on the right side of the aircraft. The navigator had to crawl past the instructor’s seat, which slid forward, to his seat in the back of the aircraft after getting in through the lift-up door on the starboard side."
The full article can be found at:-
http://www.bharat-rakshak.com/IAF/Hi...anberra02.html
Hope it helps.
Mel