Some of the early GR1A’s were converted from existing GR1’s which involved removing both guns and installing the TIRRS infra red video system and a SLIR which I believe was an upgraded version from the Chieftain main battle tank. The GR1A apart from not having any guns was fully capable of carrying conventional & nuclear weapons. The stick was exactly the same as the GR1 but with the event button ‘wired in’. The Nav/back seater also had a weapon release button too. I flew ZA369 at TTTE as they were released to various units prior to the formation of II(AC)Sqn. If I remember rightly ZA404 was present at TWCU about the same time.