What shock? They have all the right in the world to visit you, check you up as well as taking all your details. Why would they need any grounds for a visit, and how does that suggest they operate outside the law? Doesn´t matter if you are on an Elite visa. You still have to answer their questions.
I suggest you say hi and be nice to them instead, or do you have something to hide?
NO NO NO! It has nothing to do with neighbour that does not like. We do not need to make up stories or make it bigger than it is. It´s simply that the immigration offices have gotten and order to do more checks. They have been around at my place for the first time as well. No problem, I asked if they wanted coffee. They said yes and we sat down for a friendly chat. Where is the problem? Where is the harm? This forum is getting more pathetic by the day.