Pre - heat oven to 180 c (350f/ Gas 4).
Grease 2 baking sheets. Beat together margarine, sugar and vanilla essence. Stir in flour and 1 teaspoon cinnamon to make a soft dough. Cover and refrigerate for 01 hr.
Form mixture into 2.5 cm (1 in) balls and place on a prepared baking sheet, leaving space between each one. Bake for 15 minutes. Remove from the oven, leave on the baking sheets for a few minute, then transfer to a wire rack to cool. Mix together the icing sugar and remaining cinnamon; sieve over the cookies.