Pre heat your oven to 180 degrees.
Use a medium sized pot and melt the butter, sugar, golden syrup and milk over a medium heat on the stove top.
Once the mixture has melted and begun to combine add the cocoa.
Take the pot off of the heat and add the flour in small batches, beating 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.