Canberra T4 Bang Seats
I was a lowly electrician on Station Flight at RAF Upwood in 1958/9 and our T4 had bang seats for both pilot and trainee, it swung forward and latched to allow the navigator to enter, then swung back to allow the pilot and trainee to enter, finally swung to the middle and latched for normal operation.
We also had two B2's with a double actuated piece of piping on the end of each wing. These aircraft only flew at night and often came back with bits of twigs and leaves stuck on various parts of the aircraft, we then had to remove a filter from these "pipes" and hand them over to the Flt Sergeant i/c Station Flight, we called them "baccie bombers" because of the filters. We suspected they flew to certain parts of darkened Europe late in to the night and were measuring air quality/radiation levels. Some retired pilots could confirm this for me.