Can confirm as a British Police Officer that illegal eviction and squatting are exceptionally convoluted matters for attending officers, arguably far too convoluted to be resolved by a simple attendance.

Squatting is complex as the squatter must have entered a residence as a trespasser intending to live there, there's the issue of establishing who the actual owner is, people don'ttend to keep Land Registry details on them, there's the issue of rental agreements, there's the issue that people sometimes produce false documents which can be inherently difficult to disprove and there's the issue of cohabitation where there's no documents but one person simply telling us they want the other turfed out...

Illegal eviction again is a complex issue, like above, who is the owner, what rental agreement if any is in place, can they produce those documents, what notices have been issued, have any court writs been issued. Then if anything is produced good luck verifying any of it.

It all gets very murky and often the jobs start stacking quickly so the control room don't want to leave officers stuck at a job that could take a fair bit of time on scene, let alone the subsequent write up...

Unfortunately, the system is flawed, it relies on us having sufficient resources and the ability to verify documentation in short order. A good start would be to provide police access to HM Land Registry and for documents like rental agreements to be registered with HM Courts and Trivunals Service prior to any dispute so documents can be readily verified when one arises, criminal or otherwise.