Homemade Apple Pie

I made an apple pie tonight. Rob loves apple pie, so I made him this as a surprise.

Ingredients
For the pastry:
255g/9oz plain flour
pinch of salt
140g/5oz hard margarine or butter
6 tsp cold water
For the filling:
2 large Bramley cooking apples, sliced
sugar, to taste
cinnamon
caster sugar, to serve

Method:
1. Preheat the oven to 200C/400F/Gas 6.
2. Sieve the flour and salt into a bowl.
3. Rub in the margarine or butter until the mixture resembles fine breadcrumbs.
4. Add the cold water to the flour mixture. Using a knife, mix the water into the flour, using your hand to firm up the mixture. The pastry should be of an even colour and suitable consistency for rolling.
5. Divide the pastry into two halves. Take one half and roll it out so that it is big enough to cover an 20cm/8in enamel or aluminium plate. Trim the edges with a knife using the edge of the plate as your guide.
6. Cover the pastry with the apples and sprinkle with sugar and cinnamon to taste.
7. Roll out the other half of the pastry. Moisten the edge of the bottom layer of pastry and place the second piece on top.
8. Press down on the pastry edges, making sure that they are properly sealed. Trim off any excess pastry with a knife in a downward motion, again using the plate as your guide.
9. Flute the edges with a pinching action using your fingers and thumb.
10. Prick the surface of the pastry lightly and brush with milk before placing the pie in the oven. Cook for 25 minutes.
11. When the pie is cooked it should move slightly on the plate when gently shaken.
12. Slide on to a serving plate, dust with caster sugar and serve.