Even Ukip don’t dare break the unhealthy consensus on the NHS

There’s an irony about Ukip’s rise. Nigel Farage party’s popularity is driven by a widespread sense that the main parties are all the same. Yet in the past four years, the differences between the Labour party and the Conservatives have grown substantially, on issues from the size of the state to an EU referendum.

In an election year you might expect parties to converge in the centre ground as they chased swing voters. It won’t happen this time. Labour is determined to stop left-wingers defecting to the SNP and the Greens, while the Tories, who have long had their own issue on the right because of Ukip, believe that their best chance of victory comes from heightening the contrast between them and the other parties.

Labour, the Tories and the Lib Dems do still agree on some things. On immigration, none challenges the fundamental principle of free movement within the EU — something for which Ukip should give thanks.