I'm not at all sure that this is any responsibility of the pilot's. Planning law relates only to the owner or tenant of the land, it is their responsibiity to remain within planning bounds. It can't be the responsibility of the pilot if, unknowingly, he is given landowners permisson to land on the 29th day. The council can have no jusrisdiction over the pilot, only the landowner and I can't imagine the pilot has commited any offence by landing on day 29. That's not suggesting that this matter isn't of great interest and perhaps importance to pilots, clearly iy is, but not for direct legal reasons.
istr that even landowner's permission is nowhere required by law, merely by custom and even that only to avoid allegations of a trivial offense that's almost impossible to prosecute, trespass.