Robert Downey Jr has made it abundantly clear what he thinks of British journalist Krishnan Guru-Murthy after walking out of an interview with him last week.

Speaking to US radio host Howard Stern, the Avengers actor said he did not regret the incident, and said he just wished he'd "left sooner".

He then went on to call Guru-Murthy a "bottom-feeding muckraker" after pointing out his history of run-ins with interviewees including director Quentin Tarantino.

He added: "There’s an assumption that… because you’ve sat down there you’re going to be scrutinized like a kiddie fiddler who’s running for mayor…

"I’m one of those guys who I’m always assuming the social decorum is in play, and that we’re promoting a superhero movie, a lot of kids are going to see it, and that just has nothing to do with your creepy dark agenda."

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Downey Jr left the interview after he was asked about his past addiction to drugs and the actor’s relationship with his father.

However the Channel 4 News presenter defended his interview and said he believes he was in the right when asking those questions.

Writing in the Guardian, Guru-Murthy said: "I prepare for Hollywood actor interviews the same way as any other, by reading and watching what people have said before."