Preheat the oven to Gas Mark 2, 150°C, fan 130°C. Grease and line a 23cm square baking tin. In a small saucepan, melt the golden syrup with the sugar and butter.
In a large bowl, mix the remaining ingredients together, then pour in the warm butter and syrup mixture. Stir to combine, then spoon into the tin, pressing the mixture flat with the back of a spoon.
Bake for 25-30 minutes until golden. Let cool for 2-3 minutes, then mark into squares. Leave until cold before removing.
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