THE Scottish National Party will today ask the Commons Speaker John Bercow to declare it Her Majesty's official oppositon at Westminster in light of Labour's parliamentary meltdown.

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Party sources say their leader Angus Robertson now enjoys more support than Jeremy Corbyn given there are 54 SNP MPs but only 40 Labour MPs, who support the Labour leader.

It is expected Mr Robertson will make the request in a point of order following today's Prime Minister's Questions.

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The sources stress the SNP is able to fill all the relevant shadow posts to the government unlike Mr Corbyn, who still, amid the rash of resignations this week, still has to appoint people to his frontline team. There is still, for example, no shadow Scottish team.

The Nationalist sources point to parliamentary rules, which say the official opposition must be "prepared to assume power."

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"We have looked at Erskine May[the Parliamentary rule book] and will put it to the Speaker that the Labour Party no longer meet obligations to remain as the official opposition," said one senior SNP figure.