Bleeearg, the law says that you have squatter's rights if you haven't gained entry to a premises illegally. It was supposed to stop unscrupulous landlords simply deciding they had had enough of their tenants and then turfing them out onto the street without due legal process.
There are two types of squatters:
1. In certain parts of the country, like London, some people have been living in flats that were owned by the Local Authority for many years. However, somewhere along the line, the system "forgot" to charge them rent. When the mistake has been discovered, the arrears are chased, but the squatters tell them to fuck off, in some cases they have been living there for 20/30 years or even longer! After that amount of time it is difficult to dislodge them, they have been paying their utility bills and these places are their homes, indistinguishable from any others nearby. The law protects these people.
In some parts of London there are huge properties, Georgian mansions and apartments etc, which were bought up by stinking rich property developers many years ago. Because these people, many of whom are foreign (OK, Arabs), have such huge property portfolios, and so many irons in the fire, they lose track of what they own.
Homeless people may see one of these huge properties boarded up, and break in for somewhere to kip down. After a week or two without being turfed out, they think about ripping the boards off the windows and getting the electric switched back on. After a month or two, they are living there seemingly legit. After several years or even longer, the developer decides he's going to rip the building down and put up some swish apartments. Except he's not, he's not allowed. If the residents have been there for a long enough, the property actually becomes THEIRS legally!!!!!
2. The second type of squatter is a lying, thieving worthless piece of cuntscum who spots a house he realises is empty, perhaps because the resident has moved to their new place, and the empty place is on the market. He gains entry, then turns the place into a doss house, trashing the building, and hooking into illegal electricity supplies. When the legal owner returns and tries to get into his house, the locks have been changed, and he can't call the police to remove the squatters. In fact they will arrest HIM if he tries to remove them by force. He has to go through a long and costly legal process to have them evicted. Not good when you need to sell the house to pay for your new place, we are talking about ordinary people here, not rich Arab property developers.
There have been cases of people coming home from 6 week stays with sick relatives to find their locks changed and some filthy scum living in their house. When they eventually get them evicted, they find that all their precious possessions, furniture,antiques, heirlooms etc, have been spirited away, the place is trashed. The only legal requirement is that the squatters cannot have gained entry by force. Obviously, they just say that they found the door open or a broken window and gained entry through there - it is very difficult to prove otherwise.
Of course, just because the law says that you can't remove squatters by force, doesn't mean that a van full of geezers won't arrive in the dead of night, "find an open door", gain entry and proceed to "encourage" the squatters to leave. With baseball bats. As with most things, it is the old or helpless who suffer, the people who play fairly, obey the rules and pay their way throughout their lives. Squatters, on the whole, are vermin, and should be liquidated.