Third party decline in the UK: The SNP and SDP in comparative perspective

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Abstract
The failure of ‘third’ parties to displace their larger rivals is a consistent (although not universal) feature of competitive democracies which have simple majority electoral systems. It is argued that there are structural features intrinsic to most third parties which tend to accelerate the process of decline once it has set in. Because of their reliance on individual members, these parties put great stress on individual participation and provide the opportunities for it. As a result, they are particularly subject to the effects of internal competition which electoral decline is likely to intensify. The study tests this hypothesis by looking at two cases of third party decline, and concludes that the mass branch party format is ill‐able to cope with electoral failure.