Add the flour, butter and salt to a bowl (or stand mixer). Either using your fingers or the stand mixer, rub in the butter until you are left with fairly fine breadcrumbs (it doesn't matter if there are still bigger chunks of butter).
Gradually add the water one tablespoon at a time until the dough comes together (it shouldn't be sticky or so dry that it doesn't hold together properly).
On a lightly floured surface, roll out the pastry in a rough round shape, until it is large enough to fit your dish - mine was 26cm (10¼") in diameter.
Carefully lift the dough and place it in your pie dish, smoothing down and pressing up to the sides.
Gently trim any major excess from the sides but note that when baking, the crust will shrink slightly, so don't remove too much.
Pop in the fridge for 30 minutes and pre-heat the oven to 220°C (428℉).
Prick the base of the crust all over with a fork and then cover with baking paper topped with dried peas (or whatever else you use to bake blind).
Bake for 10 minutes, then remove the baking paper and peas and bake for a further 10 minutes.
Remove from the oven while you prepare your filling and reduce the oven temperature to 180°C (350℉).