Pre-heat the oven to 180°c
Place the flour & butter into a bowl, using your fingertips rub the butter into the flour until it looks like breadcrumbs( or whizz in a food processor)
Add the water, mix with a wooden spoon
Knead gently until you have a smooth ball
Place on a floured surface, roll out the dough until it is around 3 cm larger than your chosen baking tin
Place in a greased or lined tin, be sure to push it gently into the corners of the tin.
Don't trim the edges ( this can be done later if you like, but I rarely bother..I like the nobbly bits!)
Blind bake-Place some baking paper on top of the pastry, add baking beans to weigh it down ( if you don't have baking beans uncooked rice or pasta will do the job fine)
Pop in the oven for 15 minutes, then remove baking paper and beans and put back in the oven for a further 5 minutes.
Set aside to cool.