Tomorrow is the deadline for general election candidates to submit their nomination papers. One newspaper suggested that Ukip might field as few as 100 candidates. Where the party does not field candidates, who will win those votes which would otherwise have been won by it?

The answer to this question could affect the outcome in scores of seats. Although Ukip won only one seat in 2015, it won over 10 per cent of the vote in almost five hundred seats. It matters where that ten per cent goes.

To answer that question, I used data from the British Election Study (BES). In addition to asking a standard vote intention question, the BES also asks respondents how likely they are to ever vote for different parties on a zero to ten scale. Analysing these responses—called “propensity to vote scores” in the academic literature—can help identify voters’ second, third, or fourth most-preferred parties.

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