Soda bread is very easy to make. I use sour milk (full-fat). Alternatively, you can use buttermilk, or a mixture of milk and natural yoghurt.
12oz/350g good wholemeal flour
6oz/175g plain white flour
1 good teaspoon bicarbonate of soda
Pinch of salt
Teaspoon of sugar.
Put all the dry ingredients in a large bowl. Mix. Make a well in the centre. Pour in enough milk to make a soft dough, by mixing with your hands. Roll out a circular shape. Score a cross with a knife (this makes it easier to cut into quarters when baked). Bake in a fairly hot oven for 30-35 minutes.