Indeed, that's taken from Lasors 2006 which is what I quoted back to the CAA. They however then informed me that Lasors is a simplified version of the full documents which they then referred me back to which basically state that the theory must be valid (Very different wording from Lasors indeed). I have the full e-mail from the CAA at home on my PC which I'll post for your interest later. It would seem therefore that you cant entirely rely on Lasors !!