Pre heat your oven to 180 degrees and prepare your cake tin (either a brownie tin or a round tin will work)
Use a medium sized pot and melt the butter, sugar, golden syrup and milk over a medium heat on the stove top.
While that is melting place the baking soda in the second measure of milk and set aside.
Once the mixture in the pot has melted, add the cocoa.
Take the pot off of the heat and allow to cool for ten minutes before you add the flour in small batches, mixing after each addition.
Lastly add the baking soda and milk mixture.
Pour into your prepared cake tin and cook for 20 minutes.
Remove from the oven when a skewer can be inserted into the cake and come out clean.
Once your cake is cool to the touch - ice the cake.