Preheat the oven to 200C/400F/Gas Mark 6.
Put both flours in a large bowl. Add baking soda and salt and give it all a good whisk. Alternatively, sieve all ingredients into a bowl but don't forget to add the bran from your wholemeal flour that will stay on top of the sieve.
Make a well in the centre of your dry ingredients and add the yogurt mixing everything in gently with the spoon until the dough starts coming together.
Turn the dough out onto the kitchen counter dusted with a little bit of flour and gently start bringing it all together to form a round loaf. You can always use a bit more flour if your dough gets really sticky or a tiny splash of milk if it's a bit dry but try not to use too much of either.
Put your loaf on the baking tray lined with some baking paper and cut a large cross in the middle of the loaf either with a knife or a dough scraper if you've got one. You want the cross to be deep (about two thirds way through the loaf) but at the same time you don't want to cut your loaf into 4 so be careful.
Dust a bit more flour over your loaf and bake it in preheated oven for 30 minutes until golden brown and sounds hollow when you give it a little tap underneath.
Let it cool slightly on the cooling rack and enjoy!
