Tensions have bubbled between Downing Street and Holyrood for years, several issues having angered both leaders. This time round, it has been claimed that Boris Johnson, during a climate summit in Glasgow, called Scotland’s First Minister a “Wee Jimmy Krankie woman”.
The name-calling came amid difficulties in planning the summit with Scotland’s government.
The summit’s former boss, Claire Perry O’Neil, suggested Mr Johnson offer Ms Sturgeon a formal role to stop her Scottish National Party from wrecking the event.
According to The Sun, Mr Johnson replied: “Over my f**king dead body.
For example, that Holyrood had to deny certain actions, like booking buildings on the summit’s planned site for other purposes.
Downing Street denies the allegations made against the Prime Minister.
But, a No 10 source acknowledged that Boris did express “strong views about the first minister’s official role”.
These views, according to the source, included strong swear words.
The summit was dealt yet another bow when it emerged two former Tory leaders had refused to run it – David Cameron and William Hague.
Mr Cameron dubbed it “an honour to be asked” to do the job.
But, he said: “I think it’s best in these situations if you have a Government minister doing the job; you then have one line of command rather than, perhaps, two people doing the same thing”.
The spat is yet another in a long line of disagreements, the most recent being Mr Johnson’s refuel to allow Ms Sturgeon another Scottish independence referendum.