UKIP is now the fourth largest political party in Britain. They may even be the third largest - the liberal-democrats have lost a lot of ground since they had to grow up and actually DO things, rather than complain about them.
The real problem with UKIP (apart from the fact that they dont have very much money) is that they are perceived as a one issue party. They (we - I'm a paid up member) are trying to broaden the appeal but with the EU being so pervasively evil its hard not to concentrate on their inequities.
As a Tory voter, I am more and more moving towards UKIP.