Mr Alexander, who was secretary of state for Scotland between May 2006 and June 2007, said relationships between both governments was previously “broadly very good”, but said this is no longer the case.

Mr Alexander was the Labour MP for Paisley and Renfrewshire South, previously named Paisley South, from 1997 until 2015.

He said the “reality is the character of Scottish politics and Scotland’s relationship with the United Kingdom, politically has changed significantly since all three of us in our different roles served as secretary of state for Scotland”.

Mr Alexander said the change in relationship between both is down to the SNP government in Scotland.

“The Scottish National Party has been in power for 16 years. That’s longer than the iPhone has been invented.

“So they’ve been in power a long time, and in that sense, I worry that a politics focused on identity, who we are, not delivery, what we do, has been the currency of Scottish politics for a long time.”

He added: “And while I fully understand the interest in looking back retrospectively of intergovernmental relations over the last 25 years, I think if we want to have a more generative, positive, future oriented politics, characterising the relationship between the UK Government and Scottish politics, ultimately, it’s in our hands and the choices that, as Scots, and across the UK that we make in democratic relations.”