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Heat the oven to 180C/160C fan/gas 4. Butter a 23 x 25cm ovenproof baking dish. Whisk the flour, baking powder, spices, dark muscovado and half the light muscovado sugar in a bowl until well combined.
Whisk the butter, milk and eggs together in a large jar. Make a well in the dry ingredients, then pour the wet ingredients into it. Whisk everything together until just combined. Pour the mixture into the prepared dish. Mix the remaining muscovado sugar with the golden syrup, treacle and 300ml boiling water. Pour all over the batter and bake for 40-50 mins. Serve warm in bowls with vanilla ice cream.