T.4 lack of ejection seats
All IAF T.4s did not have ejection seats for the pilots. They had one for the navigator. If you go to the Bharat-rakshak site and search for "canberra book" you will be able to get my article on IAF Canberra trainer versions with details.
Seems likely the IAF T.4s were based on the early RAF T.4 design (unlikely the IAF had the ejections seats that were part of the base design taken out)
Worf