Preheat the oven to 190C/170C Fan/Gas 5. Line a 2lb loaf tin.
In a large bowl, or the bowl of a stand mixer, combine the dry ingredients: flour, ginger, cinnamon, mixed spice and baking soda.
In a medium saucepan over a low heat, combine the butter, brown sugar, golden syrup and treacle. Heat until melted, keeping an eye on it.
Once all melted, add the liquid to the dry ingredients. Add the milk and mix on medium speed with an electric mixer. Then add the egg and mix again.
Pour the batter into the prepared loaf tin. Bake for 55mins - 1 hour: until a skewer inserted comes out clean. Let cool on a wire rack.