The main problem with that is that the National Front have no real policies other than ‘send the buggers back’. The British National Party have more substance but are National Socialists in all but name. Have a look at their manifesto and tell me if you like what you see.
The only real conservative option is the UKIP, and they are seen as something of a joke.
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.