Abstract
The debate about electoral reform in Britain has taken a new turn with the latest upsurge in mid-term support for the Liberals, the launch of the SDP, and the immediate electoral success of the Alliance between the two parties. We do not deal here with the durability or consequences of these developments. We are concerned with the electoral system that they put under challenge. This concern is the more important because, as we shall show here, the working of that system altered fundamentally between 1955 and 1979. Before considering how fragile ‘the mould of British polities’ is or whether it should be broken, it is appropriate to reconsider and remeasure the precise shape and texture of that mould, and establish what are the chemical bonds which have determined those characteristics.

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