Two weeks ago, I watched an interview of a UK leftist reporter. He was a long-term Labour Party guy but things were so screwed up that he fully intended to vote for May, and against the Labour Party on this election. He noted that he knows a fair number of people who intended to go the same way.
In terms of polls....I have my doubts that they are actually capturing the accurate nature of this particular election.
UKIP would be better, unless the Cameron wing of the CP has been decimated and replaced by Thatcherites.