All early T4's had an ejection seat for the nav. and two "normal" and uncomfortable saets for student pilot and QFI. Can't remember when they were modded. to "bang" seats in the front - early 60's I think. PR3 and 7 aircraft only had two ejection seats - pilot and nav. Third crew if reqd. sat on the dreaded "rumble" seat next to pilot or, after T/O, went to sleep on the more comfortable "couch" in the nose! Great aircraft and great days!!