1. Preheat oven to 200 degrees and line a baking tray with baking paper. 2. Sift the flour, sea salt and bi-carb into a mixing bowl. Stir in the chopped rosemary. In a small mixing bowl whisk together the yoghurt, milk and Dijon mustard. Make a well in the dry mix and gently pour in the wet ingredients. Gently fold the ingredients together until combined. 3. Using floured hands scrape the dough onto a baking sheet and manipulate into a rough round. Top with thyme leaves and a dusting of flour. Bake in the oven for 30 minutes. Allow to cool before slicing.