Pre-heat the oven to 170 degrees Celcius or 150 fan / 325 F / Gas mark 3.Combine the coconut, cake flour, sugar and oats in a bowl and whisk a few times.Heat the butter, golden syrup and add the bicarbonate of soda when it starts bubbling then after a minute add the hot liquid to the dry ingredients.Empty the cookie mixture into an oven tray and ensure it is smooth, even and compact. You can use the bottom of a flat measuring cup to do this.Bake for 20 minutes, then cut, and turn the crunchies around on the cookie sheet and continue to bake on the other side for another 10 minutes to crisp it up.