Sieve the flour, salt and bicarbonate of soda into a bowl, add the oatmeal and mix.
Cut the butter or margarine into small portions and rub into the mixture with your fingers.
Add the sugar and mix well.
Pour in the milk and mix until you have a stiff but workable dough.
Shake some flour on a worktop, turn the dough onto it and shake a little flour on the top.
Roll out thinly (about half an inch thick) and prick over with a fork.
Cut into rounds with a scone cutter and place on an oiled baking tray.
Bake in a pre-heated oven for 15/20 minutes at 350F/180C/Gas Mark 4.
Use a palette knife to lift the biscuits onto a wire cooling rack.
Store in an airtight tin.