Although some commentators credit the invention of SV to Plant, it was actually the brainchild of the then Labour Member of Parliament (MP) for Workington, Dale Campbell-Savours, who advocated and outlined it in an article he wrote for an issue of the left-leaning New Statesman magazine that was published four years before Plant reported, on September 29, 1989.
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Incumbent mayor Ken Livingstone, candidate for the Labour Party, formed an electoral pact with the Green Party mayoral candidate Siân Berry via the supplementary voting system, in which Labour voters were encouraged to place the Green candidate as their second preference, and vice versa.