BRIAN Cox delivered a scathing verdict on Labour directly to Keir Starmer as the actor explained why he left the party to back the SNP.

The Succession star, speaking alongside Starmer on the Andrew Marr Show, says he is “disgusted” by how Scotland has been treated by Westminster.

Cox, who was the voiceover for Tony Blair’s campaign adverts in the 90s, quit Labour in 2015 to join the SNP.

He cited Brexit and the Iraq War as key reasons for switching to back independence.

The actor was on the BBC programme to discuss his new autobiography and the third series of HBO hit show Succession.

Asked why he left Labour, Cox explained: “It comes really down to what I thought was a failure of social democracy, particularly around about 2012, 2010. Also, the Iraq war, that affected me. Blair's hubris affected me. And I saw the party going in a certain direction.

“I was really very concerned because I'm a socialist.”

He acknowledged he agrees with Starmer about “many things”, adding: “But my country was traduced for long enough, time and time again. We voted 62% to stay in Europe and we were ignored. And if you think about the Thatcher years, we were ignored.

“So Scotland has always been sidelined.”

Starmer admitted his party has “hard work” to do to win back voters in Scotland, which he said “has to be an essential” of policy – “not an afterthought or a secondary consideration”. The Labour leader once again ruled out any prospect of a deal with the SNP at Westminster as a possible route for the party back into Number 10.

WATCH: Andrew Bowie squirms as Brian Cox praises Scotland's Covid efforts

Cox was asked for his thoughts on Labour’s decline. He replied: “It's a hard question. It really is. It's a painful question. You know, I've been I've been caught. I look at what happened in the north [of England] in the last election and I was devastated by that because I'm a socialist.

“Also, I have to put my country first because I have looked at what's happened to my country and I'm disgusted.

“The penny only dropped later. Because I was young, I was ambitious, I was thinking about other things. I wasn't thinking about politics and of course, I was the voice of Labour in 1997. I did all the ads, and I gave myself to it.

“But at the end of the day, Scotland is prime for me.”

Last year, the actor provided the voiceover for an SNP campaign video ahead of the Holyrood election.

In it, he explained why Scotland “has what it takes to be an independent country”.

Cox also spoke about Scottish independence in an interview with the Sunday Times to promote his new book, Putting the Rabbit in the Hat.

“The United Kingdom is not united," the Succession star said. “We have been at the tap end of the bath long enough. We deserve to have our back against the smooth surface for a while.

“It’s been tough and it is tough, and I think Nicola [Sturgeon] does an incredible job and it’s a tough job."