A lobby group against gay marriage, formed by MPs and bishops, is embroiled in a row after one of its leaflets claimed that the logical argument for reforming the law would be equally applicable to the legalisation of incest and polygamy.

The eight-page document, produced by the Keep Marriage Special campaign, whose supporters include the former bishop of Rochester, the Rt Rev Michael Nazir Ali, warns of the "consequential impact" of the reform.

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