Combine the oats wholemeal flour, ¼ cup cast and desiccated coconut in a bowl. Melt golden syrup and butter together over a low heat in a saucepan. In a small bowl whisk the bicarb soda in the water to form a smooth paste. Remove the butter from the heat and whisk in the bicarb paste. It will bubble up. Quickly pour it into the dry ingredients and then use a wooden spoon to bring it all together.
Drop 1tbsp of mixture onto a lined biscuit tray. Repeat with remaining mixture. Bake for 12-15mins.
You can switch the flour for white flour or gluten free flour if preferred