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According to Jeremy Corbyn, the SNP ended the 1974-9 Labour government and is therefore ultimately responsible for the de-industrialisation, miners’ strike and poll tax that followed under the Conservatives.
There is some truth to this charge: Scottish Nationalist MPs did not back the government in a vote of confidence held in the Commons on 28 March 1979. Given that Jim Callaghan’s minority government lost by just one vote, the SNP could have saved it, as it had done a few months before.