Ncuti Gatwa got into a bit of trouble for using colourful language on Doctor Who (Picture: BBC)

Doctor Who star Ncuti Gatwa has revealed he received a talking down for his potty mouth while on set.

The Sex Education star, 31, was last year announced as Jodie Whittaker’s replacement as the Time Lord.

He made his first appearance on the final of the three recent specials, which saw David Tennant briefly return to the role.

However, when filming the show, the actor was told off for using some colourful language while in costume.

After the fact, Ncuti revealed showrunner Russell T Davies pulled him aside for a chat.

‘The only time I’ve ever gotten in trouble for anything was when I swore while wearing a Doctor Who costume,’ he explained.

He made his first appearance as the Time Lord a few days ago (Picture: BBC)

‘I got called into Russell’s office. Woo! And he let me know that that’s not acceptable.

‘He said, “Do what you want when you’re out of costume, but when you’re in costume, do not let us catch you swearing”,’ he added when speaking to The Sun.

The actor previously told The Radio Times he was learning quickly on how to be a ‘PG role model’ after his run-on Sex Education

‘For the last four years I’ve been co-leading an X-rated show, and so I’m on a constant journey of learning what it is to be a PG role model and the lead of a family show,’ he told the Radio Times.

Over the weekend he made his debut in the long-running franchise in regeneration scenes that drove fans of the series wild.

While fans knew the third 60th anniversary special, The Giggle, was going to be the last time they saw David in the starring role, the way he was sent off caught many off guard.

He will next be seen in the upcoming Christmas special (Picture: BBC/Bad Wolf)

A rare regeneration saw David and Ncuti’s Doctors able to exist as two beings, with many people expressing their excitement at the plot twist.

‘OMG DOCTOR WHO!!! David Tennant AND Ncuti Gatwa the way I SCREAMED. It’s too much awesomeness on one screen,’ someone shared on social media.

Others said they were left in tears watching what had now become their ‘favourite episode and regeneration that has ever happened.

The upcoming Christmas special, The Church on Ruby Road, sees the Doctor come face-to-face with e mythical and mysterious goblins as his life collides with new companion Ruby Sunday, played by Millie Gibson.

Doctor Who’s 2023 Christmas Special airs on December 25 from 5.55pm on BBC One.

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‘He let me know it wasn’t acceptable.’