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You are right that the Hornby track separation is way over scale. The correct scale track centres measurement is 45mm but if you used that nothing would get round any but the most gentle bend. Peco streamline uses a nominal 50mm but if you measure accurately it is nearer 52mm.

I'm afraid that if you are going to use set-track curves then you are going to have to put tracks much wider apart than the prototype. This is so that long engines and coaches can pass without touching and derailing. Well away from the curves you could bring the tracks closer together. However, this will present a problem with points on a crossover. There are ways of reducing the separation by cutting points if you really want to do that.
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