Bronx
I've haven't got the other two documents to hand, but if you wish to push the point, you can also look at Article 118 of the Air Navigation Order 1995 as amended, which covers landing sites in uncongested areas. If the site is in a congested area, then specific permission must be granted by the UK CAA.
By the way, I am a UK licensed aircraft commander, are you? (Translation, I am becoming a little fed up of you second guessing me, when it is clear that you do not know what you are talking about.)