Warmtoast- so if that's not a GCA radar set, I wonder how non-visual approaches were made at RAF Changi in the 60's? I don't recall a dual system as you explain the GCA to be. There were certainly regular night landings, with the local Hastings and Shacks flying at night and often the Transport Command Comets and Brits came over night, so I expect some talkdown facility would have existed. There were certainly many days of wet weather with low cloud in the monsoon months.
David T.