My biggest worry if the Tory/UKIP get in for the next term, it's the opening of the Pandora's Box (and the numerous cans of worms therein) of leaving the EU.
I don't even pretend to understand the ramifications of leaving the EU, but I know it's considerably more involved than a few 100 thousand immigrants and whether one's banana is within the 3 degree regulation of curvature for yellow coloured fruit.
Switzerland and Norway operate perfectly well outside the EU, in fact they abide by most of the rules except the open doors policy.
Iceland have just decided not to continue to negotiate to join the EU.
As for leaving, I don't believe Ferage, nor the others and least of all the EU. I was in the audience of the Ferage/Clegg debate on the BBC last yea and it was obvious to us all in the audiance that neither side were telling the whole truth - why would they? they are Politicians.
The UK is the 2nd largest contributor so the EU won't want us to go......
This link gives some simple stats for 2013:
EU budget: what you need to know - Telegraph
The EU is socialism through the back door, whether we like it or not, and the reason so many countries want to join is because they are all poor and will get out far more than they put it. Its a bit like you changing jobs, with a huge payrise, for doing exactly the same thing.
Interestingly all new countries have to join the Euro, but the "older ones" such as Poland have decided not to join the Euro zone - so its all a bit of a mess IMHO and the fact the "takers" can ALWAYS out vote the "givers" is where they need to start, when it comes to reform.
As for the Conservatives doing a deal with UKIP - I simply don't see that happening. More likely, a 2nd coelition with the Liberals as no one party is going to get a majority.