I believe that the helicopter used by Triang was the same as the one used by Lionel. There is a Lionel O gauge helicopter wagon on display in a Melbourne model shop which has the very same helicopter on it as the Triang Battle space car does.
Coming from Kent and actually remember seeing it on display in Canterbury (it still exists in a museum in Whitstable), a model I would most definitely buy would be a model of the world’s first steam passenger railway locomotive "Invicta",