I was an ATCO at RAF Tengah 68-71 and was impressed by the way that Butterworth-based 3 Sqn and 75 Sqn RAAF (Mirage lll) would recover as a pair 'in trail' so that the controller only talked-down the leader and the No 2 dutifully followed him on his AI radar. When I was detached to RAAF Darwin (before the hurricane) to support 74 Sqn (Lightning F6), I discovered why. The Quad radar could be operated as precision radar (GCA) or search radar - but not both at the same time, so when the leader of a pair was on talkdown, his No 2 was out of radar contact and got no help with navigation towards the centreline. Good thing the sun was shining - Darwin was fun......