Could be wrong!
A house close by sold a few months ago, one or two men arrive at odd times to do work in there. Not that unusual, but another neighbour showed concern after hearing an argument, where one of the men seemed afraid of the other, hard to explain, but in a really desperate and terrified way.
Since we already thought it was curious, DH checked the car registrations belonging to the two guys and neither are registered. We are in Cheshire, one of the plates suggests Southampton, but is untraceable.
We ran a few other (legit neighbour) vehicles through the checker and they were ok, just to see if it might be random. Seems an odd coincidence?
Just to add, it isn't a drug farm as we can see in, and were invited in for a quick chat weeks ago. Just looks empty in there, needs plastering, etc.