The rapid expansion in support for the Scottish National Party between the 2010 and 2015 general elections substantially changed the country's electoral geography, as again did its relative decline at the next election in 2017. At that last contest, however, the SNP won many seats with fewer than 40 per cent of the votes cast, a situation very different from that in the rest of Great Britain. That difference -which had a considerable impact on the formation of a government in June 2017 -came

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... ut because of the nature of the competition in individual seats. These data are taken from House of Commons Library (2017a). Detailed sources of voting at each constituency were obtained for the