Sadiq Khan and Manchester leader Andy Burnham - have written to Boris Johnson to demand he looks again the constitutional status quo.
The letter warns there is worrying evidence that a growing number of Scots are "losing faith" in the union. Polling suggests the SNP is on course to win a majority of MSPs at next year's Holyrood election, with Nicola Sturgeon campaigning for an IndyRef2 to take place in the next few years.
Boris Johnson's attitude to devolution has also been questioned in recent weeks after he reportedly described the opening of the Scottish Parliament in 1999 as a "disaster".The letter to the Tory leader - which has also been signed by former PM Gordon Brown and Lib Dem grandee Menzies Campbell - said that instead of.
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