Preheat oven to 190℃ / gas mark 5. Grease a baking tray or line with greaseproof paper.

In a large bowl, rub the margarine into the flour until the mixture looks like fine breadcrumbs. Add salt, baking powder and oats and combine.

Add cold water little by little to bind the dough-try not to make it too sticky.

Roll the dough out on a floured surface. Cut into desired shapes and place on greased/lined baking tray.

Bake for 15 to 20 minutes, or until firm.