adverse occupation of residential premises It is an offence for a person who is on premises as a trespasser, after having entered as such, to fail to leave on being required to do so by or on behalf of a displaced residential occupier of the premises of a protected intending occupier (i.e., one who has in those premises a freehold interest or leasehold interest with not less than 21 years still to run who acquired the interest for money or moneys worth, who requires the premises for his own occupation as a residence and is excluded by the trespasser).