8 oz flour (plain white or plain wholemeal or a mix of the two)
4 oz margarine
pinch of salt
Mix the salt into the flour(s) and then rub the margarine into the flour with your fingertips, lifting it into the air as you do so (it's worth doing this in a large mixing bowl). When the mixture resembles breadcrumbs, shake the bowl and if there are any lumps sitting on the surface just rub these into the mix. Add a little water, a couple of tablespoons at first and mix with a fork. Add enough water (not too much at a time) until you can gather the mix into a ball and it holds together. Wrap the dough in cling film or pop into a plastic bag and place in the fridge for at least half an hour.
Preheat your oven, Gas Mark 6, 200 deg C. Remove the dough from the fridge, and placed on a lightly floured surface. Gently roll out with a rolling pin until it's about 4mm thick. Lightly grease a flan dish with margarine and place the rolled out pastry over the flan dish. Press it lightly down into the sides and edges and trim off any surplus with a sharp knife. Prick the pastry in about 12 places with a fork (so that any air trapped under the pastry will escape when you bake it). Pop it into the preheated oven for about 5 or so minutes, just to start to bake. Don't allow it to brown and as soon as the pastry feels dry to the touch, remove and allow to cool. Fill your flan with your fillings and bake at the same temperature for about half an hour or until golden brown and cooked.