Sift the flour into a large bowl.
Add the cubed chilled butter and rub it in with your fingertips until the mixture resembles fine breadcrumbs.
Then stir in the salt & sugar.
Finally add 2-3 tbsp of cold water a tbsp at a time and mix together until you have a firm dough.
Turn the dough out onto a floured surface and knead lightly.
Wrap in cling film and chill for 30mins before use.