In a large mixing bowl place the flour and rub in the butter. Stir in the sugar, salt and yeast and mix to a soft dough with the milk. Turn out on to an unfloured work top and knead for 10 minutes until smooth. Cover and prove until doubled in size.

Lightly grease two baking sheets. Break up the Toblerone into triangles and cut each triangle in half. Divide the dough into 20 pieces. Keep the rest covered, take one piece of dough at a time and flatten to a disc in your hand. Place a piece of Toblerone in the centre and pinch up; the edges to seal. Roll into a ball between the palms of your hands. Repeat with the remaining dough, placing the balls well apart on the baking sheets. Cover and prove again.

Lightly brush the buns with milk. Chop any remaining Toblerone and sprinkle over the tops. In a pre heated oven 200 C/400 F bake for 10-12 minutes before removing and cooling on a wire rack.

Dust with icing sugar.