The Crown star Josh O’Connor has spoken out against the culture secretary’s calls to add a disclaimer to Netflix regal drama as “outrageous”.

The fourth series of the streaming giant’s lavishly produced series arrived last month and has been in the headlines since, attracting criticism for allegedly not doing enough to ensure viewers know it is a work of fiction.

Season four features Princess Diana (played by Emma Corrin) and dramatises her relationship with the Prince of Wales, played by Josh.

Oliver Dowden, the culture secretary, had asked Netflix to add a disclaimer to episodes, a request the US company denied.

In a new interview with the LA Times’ podcast The Envelope, Josh says the show has been “let down” by the MP at a time when the arts are suffering because of the pandemic.

“We were slightly let down by our culture secretary, whose job it is to encourage culture,” Josh said.

“In my opinion, it’s pretty outrageous that he came out and said what he said. Particularly in this time when he knows that the arts are struggling and they’re on their knees, I think it’s a bit of a low blow.”

Josh insisted viewers are aware The Crown is a work of fiction.

“My personal view is that audiences understand,” he said. “You have to show them the respect and understand that they’re intelligent enough to see it for what it is, which is pure fiction.”

Earlier this week Netflix said it had “no plans – and sees no need” to add a disclaimer.

However, Josh’s co-star, Helena Bonham Carter, who plays Princess Margaret in the third and fourth series, said the show has a “moral responsibility” to make it clear to viewers it is a drama and not historical fact.

In an interview recorded for The Crown’s official podcast after filming on season four finished earlier this year, Helena discussed the differences between “our version” and the “real version”.

Peter Morgan, who created The Crown, had previously appeared on the show’s official podcast to defend his right to creative licence.

However Earl Spencer, Diana’s brother, has indicated his support for a disclaimer being added.