My parents were like this, they weren't going to vote in the euro election but considering the vile filth the UKIP is broadcasting they and all it takes for evil to prevail is good honest people to do nothing they felt motivated to go and vote. Probably green or lib dem
That's where a lot of the votes will be lost because people who are against UKIP do not have a specific party they can all back uniformally, thus giving UKIP an advantage to landslide this election, if it's genuinely a protest vote.