Immigration and its complete lack of checks and bounds has been a problem for many people (rightly or wrongly). Til UKIP started making progress, NO ONE really touched the issue at all. Voting between two parties on the issue was like a wasted vote.
UKIP has forced them to address the issue
Yes, all the above is true, however, to fully understand this phenomena one needs to get a full picture. Let me wrap it up in a simple story:
The land was peaceful and prospered. Then one night a small group led by a loud drunk appeared in random taverns in the land opening the doors, shouting "Zombies! Hide your wives, hide your children. Zombies!" before promptly closing the doors and running away in panic.
The alarmed people started repeating this unusual message to each other in taverns and market squares, often adding new elements to the tale. Some claimed zombies were spotted in nearby woods. Others would say that they'd heard from their twice removed cousin that their wives brothers uncle met someone in church the other day who was just organising funeral for their sisters nephews girlfriends kid, who in turn, was, in fact, eaten by zombie few days prior. Ugly affair that, they had to chop the small head off the poor thing, to stop it from turning into a zombie too, the next person would add. Alarmed elders turned to their lords for help.
The king and princes of all the lands called their best scouts and advisors to investigate. Many weeks they investigated, then all returned to the castles. "My lords, we've traveled far and wide, no zombies were seen by us or anyone in person anywhere and we found no tracks, marks or victims of zombies in any county. All we heard was folk tales and rumours, which don't seem to be true".
But the rumours would not rest. Random hysterical individuals were now seen addressing crowds on sundays, warning of imminent danger, advising people to arm themselves and lock their doors at night. Travelling salesmen would now sell stakes, machetes and other zombie weapons by the barrow load. The word was spreading and now every time someone mentioned story of that sisters nephews girlfriends kid allegedly eaten, someone nearby would always confirm "yes, I've heard that too". The fear was spreading. Alarmed elders once again turned to their lords for help.
The king and princes once again assured elders that no zombies were seen anywhere and that everyone was safe. But the elders wouldn't budge. "Maybe the guy who knows about zombies should be our leader" they mused. If he's wrong, we'll have some defences against zombies just in case, but if he's right, when zombies come, we'll be ready, you can't go wrong with such a leader?".
The king couldn't allow this to happen, so he pondered for many days and finally came up with a solution to calm the crowd down and stop the rumours. He called the elders back in and said "I, the king, am in agreement with you - something must be done about those zombies. I shall quadruple the number of patrols currently guarding your farms against zombies. Any zombie encountered shall be slayed on the spot. I personally vow to provide each man who had a member of their close family eaten by zombie the victims weight in gold. And I decree that zombies from now shall be banished from our land and forbidden to re-enter for all times."
Now, where we are, with UKIP, in this story is the point where the drunk and his merry men reveal to the people that king lied - no ban on zombies was written into the law, not a single zombie patrol rider left the castle, not a single slayed zombie body was displayed and nobody got paid even a single penny for the victims. And people feel betrayed and stand at the gate with pitchforks and torches, rioting.
But what they are missing, is the fact that the king was telling the truth. Zombies were never real. So no zombies were ever slayed. And no patrols were ever needed. And four times more patrols, is still no patrol at all. No victims were ever eaten so no gold ever had to be paid. And no law banishing zombies ever had to be ever written.
The problem that lead to mass panic and fear, simply never existed at all.