Preheat the oven to 180°C.
In a bowl, sift together flour, icing sugar, ground cinnamon and baking powder.
In a separate bowl, beat milk and egg together, then add the raisins and bicarbonate of soda.
Add butter to the dry ingredients and mix together with your fingers until you have fine crumbs.
Slowly, add some of the liquid to the dry ingredients and mix the dough. Be cautious not to overmix though, the dough must have a soft, but firm texture.
With a rolling pin, gently roll the dough until it’s approximately 4cm thick. Press the buns out with a round cookie cutter and place them close together on a well-greased baking sheet.