Here's the Scottish version!
4 tablespoons granulated sugar
2 tablespoons Tate and Lyle Golden Syrup
1 teaspoon bicarb of soda
Put sugar, syrup in a pan, bring to boil stirring constantly. Boil for 8-10 minutes, stirring occasionally. Remove from heat, stir in soda quickly until it froths. Pour into well-greased tin and cool. Break up when cool, store in airtight container.
If you want to make it more fancy, dip the cooled pieces in melted chocolate to make a homemade 'Crunchie' bar.