This recipe is the best, I tried a different one this evening and it wasn't nearly as good...I found it on the bbc website
225g whole wheat plain flour
225g white flour
10mL bicarbonate of soda
300mL (one half pint) natural yoghurt
150mL (one quarter pint) warm filtered water
1 pinch salt
This will make two small loaves or one large one.
Preheat oven to 200°C (400°F or Gas mark 6). Sift the flour (it's important to do this, as the bread can be a bit heavy) and mix in the raising agent, then stir in the yoghurt and warm water. Mix together well, then coat the mixture with more flour and liberally flour your work-surface. No kneading is necessary.
If making small loaves, divide the dough into two parts and make them into fairly flat oval shapes. Cut a cross on the top of each loaf. Place the dough on a floured tray and bake for 30 minutes, then turn down to 180°C (350°F or Gas mark 4) for another 20 minutes. To test if the bread is ready, tap the bottom of the loaf and it should sound hollow. Leave the loaf or loaves to cool on a wire rack.