Preheat oven to 180 degrees C. Lightly grease one small round cake tin.
Melt all but 1 tablespoon of the butter. In a medium sized bowl mix together the melted butter, 1/2 cup white sugar, 1 tablespoon cinnamon, and the self raising flour to form a soft dough. Add the milk and mix again till smooth. Pour batter into prepared tin.
Bake in pre-heated oven for 15 to 20 minutes. Remove cake from oven and set aside. Once cake is cool enough to handle remove from its tin and place on a serving dish.
In a saucepan melt the remaining 1 tablespoon butter and mix with 1 tablespoon white sugar and 1/2 teaspoon cinnamon. Spread over top of cake.