I disagree. I think Rob Hutton had it right, but the absence of proportional representation makes it unthinkable. The vacuum caused by the non-existence of a credible left-wing tough-on-immigration party has led to UKIP peeling off Labour voters and the alleged “apathetic” non-voters. Labour needs to split into at least two parties, one for people who lean towards open borders - and one, probably a much larger party, for people who genuinely want tougher controls on immigration, possibly with a cultural affinity measure included in those controls. I say at least two because different immigrant populations might want to form their own parties too. But first we need proportional representation to make that split achievable.