Pour the vinegar (or lemon juice) into the milk and leave it to curdle while you prepare the dry ingredients

Mix the flour, bicarbonate of soda, salt and sugar in a large bowl

Pour in the milk, and use a metal knife to combine the ingredients into a dough

Bring out onto a floured surface and give the dough a quick knead just to bring it all together in a loaf- about 30 seconds

Shape the dough into a round load, score a cross over the top with a sharp knife, and transfer onto a baking tray covered with baking paper

Bake for around 35 minutes at 180c (it may need a little longer than this- you can insert a sharp knife into the cooked loaf to see if any sticky dough is still left in the middle. If so, pop it back in for a little longer (you can wrap it in foil to prevent further browning.)