The hon. Gentleman is making a powerful case, largely about local authority sites. In Buxton, in my constituency, Irish-heritage Travellers could not get on to the local car park and instead invaded the car park of a local business. They proceeded to spend several days there, threatening the staff and making a complete mess of the car park, making it almost impossible for the business to continue. The hon. Gentleman makes a good point about aggravated trespass becoming a criminal offence, because it would enable courts to act much quicker than the minimum of two weeks that a civil case takes.