I really wonder who are those experiencing the impact of mass immigration
People living in poor areas? Cheek by jowl housing?
Hmos or housing that should be classified as an HMO but more than often isn't, can cause huge issues.
They have become very common now all over the country. That is for instance a terraced house with two/three bedrooms being turned over entirely to bedrooms, with multiple occupants in each. A couple of these houses on one road and its easy to see why it can become an issue. If too many people are using one house there are knock on issues of facilities, noise, rubbish and so on.
I have read many "personal impact" stories of people living next to such housing, with social issues, fighting, urinating on the street, rubbish pile up, rats, child truancy, constant noise, smoking and so on. As YourPerception has said, when your party is telling you these immigrants are a positive contribution to the UK and net contributors, I think one can understand why those people have been forced to turn to UKIP.
Obviously we cant put all immigrants into the same bracket, most are net contributors and are good neighbours and good positive members of society, but with such high volume of migrants and therefore high numbers of good and less positive, one can see how this experience can cloud a voters view.