I am just checking in "English Electric Canberra" by Beamont and Reed (1984). They make no reference to early T4s being without ejector seats. Quote: "Entry ... was also complicated by the complex sliding ejector seat of the instructor". As the prototype T4 (WM467) first flew in 1952, I take it that it already had ejector seats. So it is interesting that 603DX so clearly remembers his not being so equipped in 1957. I wonder, do you recall the serial of the T4 you flew in?
Laurence