Preheat the oven to 170C (fan) and line a loaf tin with baking paper.
Cream butter and sugar together until it is light and fluffy. If not using a mixer and the butter is cold, then grating the butter will make it much easier.
Whisk in the egg.
Add treacle and syrup, stir to combine.
In another bowl, sift the flour together with baking powder, the spices and a pinch of salt.
Add half the syrup mixture to the flour and stir before adding half the milk. Repeat this with the remaining syrup and milk until the flour is fully incorporated.
Pour the mixture into the loaf tin and bake for 50 minutes. Remove from the oven and carefully lift the loaf out of the tin on the baking paper. Leave to cool to allow the sponge to firm up before slicing.