To make the biscuits beat the sugar and butter together in a bowl until light and fluffy. I made my icing sugar by putting granulated sugar into my Optimum Vac 2 blender
Add all the dry ingredients and stir well
Add enough milk and bring together into a soft dough
Using a piece of cling film on a clean surface, roll the dough into a log with a diameter of approx. 5cm, then wrap the dough in the clingfilm
Place the dough carefully into the freezer to cool for 15 minutes (alternatively cool in the fridge for 30 minutes)
Once cooled, heat the oven to 170 degrees C/150 degree fan/Gas mark 3
Line two baking trays with non-stick baking paper or re-usable silicon paper
Unwrap the dough and with a sharp knife slice into disks of approx. 1cm thickness. If the dough crumbles just stick it back together
Place the discs of dough onto the prepared baking trays with 2-3 cm between them
Bake for around 25 minutes until firm
Remove from the oven and allow to cool before filling with icing
To make the icing combine the ingredients together to form a smooth, thick paste