UKIP is attracting thousands of Labour voters who have rejected mainstream politics and rational thought.

Experts said the party could overtake Labour because its simplistic message can appeal to angry, gullible people across the political spectrum.

Martin Bishop, author of The Way the Stupid Vote Now, said: “You don’t have to be a disgruntled Thatcherite to believe that Britain is shit because of the EU.

“You don’t have to be a former BNP voter to believe that Romanians eat cats.

“Just because you live north of Birmingham and your grandfather wore a cap, doesn’t mean you’re not an utter fucking dipshit.”