Preheat the oven to 350 degrees. Lightly butter an 8 by 4 inch loaf pan, line the pan with baking parchment and lightly butter the paper.
In a small bowl whisk together the flour, baking powder and salt.
In another bowl beat the butter until light. Add the sugars one at a time, beating well after each addition. Beat in the Lyle's Golden Syrup. Add the egg, and continue beating until the mixture is light and fluffy.
Stir in half of the flour, followed by the milk and then the remaining flour.
Pour the batter into the prepared pan and bake for about 40 minutes until golden in color and the cake springs back when touched lightly. Cool completely on a cooling rack before slicing.