"We do need [...] to avoid falling into the trap of assuming that, simply because populist radical right parties have increased their support at the same time as social democratic parties have lost theirs, the change is due to working-class voters moving en masse from one to the other," writes Tim Bale is professor of politics at Queen Mary University of London.

Indeed, the latest research suggests that this is far from the case, with most of those flocking to the far right coming either from more mainstream rightwing parties or from the ranks of the serially disillusioned.