Step #1 Put sugar & butter in a bowl & cream until light & fluffy (or until your arm really aches if having the food mixer on will wake the whole house!).
Step #2 Sift the flour & cinnamon into the bowl & mix to form a smooth dough.
Step #3 Roll out on a lightly floured surface to about 1/8in (3mm) thick.
Step #4 Cut out rounds using a 2in cutter & place on a greased baking sheet.
Step #5 Knead & reroll trimmings until you have no more dough left.
Step #6 Dredge the biscuits with caster sugar & bake this at gas mark 4/180degC/350degF for 8-9 mins until just firm to the touch.
Step #7 These biscuits do harden up as they cool - if you leave them to cook this until they feel cooked enough you will end up with something which sounds just like a ceramic tile when you tap it against the worktop!
Leave to stand for a min or two & then transfer to wire racks to cool.