Answering my post above. I ended up buying the Glasscoat finish from the dealership (at an inflated price!) and it really is worth having.
Rain just beads up on the flat surfaces and when you pull away the car almost dries itself. When it comes to washing the paintwork and trim it's fantastic. No effort and the dirt just disappears and you need to do almost no leathering off.
I was initially sceptical, but from now on all cars I get will get the treatment.
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