I am not aware of a detailed study, but certainly using a few basic statistical ideas some indeed may have fears albeit unfounded about resources etc. Some almost certainly dislike anything they regard as different

Mr Farage knows all too well what agenda he is pursing 

The best quote at a local election was when the incumbent had switched to being the UKIP candidate and a voter who indicated the UKIP candidate must be better than the previous  MP at least, whom he considered awful, apparently unaware they were the same person