The F4 sim at Coningsby had the flat earth model when I first went through. It had been set up for the GA days and was largely redundant for the medium level AD stuff we did in the early days.
I remember it was set up with a model of a Hastings on a pole so we could run VIDs against the model. No idea how they worked the overtake problem! One wag tied a fly to the Hastings and asked a crew to close for a VID. Carnage in the cockpit apparently!