(other people's) private landing sites
In the UK we can land our helis more or less where we want (Rule 5 etc notwithstanding) "provided we have the landowners permission".
I can hold my hand up to having landed in the wrong place on several occasions, but the residents found it amusing to have a heli suddenly appear in their field / garden whatever. No harm done, they pointed me in the right direction and off I went.
What would happen, however, if they took umbrage and made a complaint? Is the pilot breaking any "CAA-related" laws, or would we be talking trespass or something similar?
In fact is the "landowners permission" written down in any aviation regulations, or is it just something that has been passed on from generation to generation?