Preheat oven to 180C.Grease and lightly flour  your cake tin (or line with greased grease proof or cooking paper).

Gently melt butter and golden syrup together over a low heat and set aside.

Sift flour, cocoa and baking powder into bowl. Add eggs, sugar, vanilla.

Warm milk, add baking soda to it, then (quickly) add that to mixture in bowl. Beat well, then beat in warm butter and syrup.

Bake 25 or 30 min.