1. Sift the dry ingredients into a bowl, rub in margarine and grated cheese, mix to a soft dough with the egg and milk.

2. Shape mixture into a roll about 38cm long, wrap in grease proof paper, then aluminium foil and refrigerate for at least 3 hours.

3. Cut roll into slices 5 mm thick, place on greased baking trays. Bake at 180 °C (350 °F) gas mark 4, for 15 minutes, until light golden brown.