Be careful when buying coconut flour as some brands are simply dessicated coconut ground fine. Real coconut flour is de-fatted and behaves very differently in recipes to dessicated.

If you have a Morrisons near you, they sell Groovy Coconut Flour for £3.76 for a 500g pouch which a pretty good price. Its similar to prices on Amazon for the real thing. Cheap prices usually mean its ground dessicated.