Prince William becomes the first royal on Graham Norton's sofa and reveals Charlotte and Louis are 'obsessed' with Celebrity Traitors

Prince William revealed he deliberately tried to startle Ross Kemp the morning after the opening episode aired to gauge his reaction, finding him 'really jumpy'. The Prince of Wales drew gasps and cheers from the audience when he appeared on a special Earthshot Prize edition of the show, recorded on Thursday. He also disclosed that he had once thought about a career in the police. The episode is due to air on BBC One at 10.40pm on Friday.

Cate Blanchett, Robert Irwin and Hannah Waddingham were also on the sofa, all linked to Earthshot.

William said 'negativity and doom' about the environment got him down before he founded the prize.

He called himself 'a big fan of everything Christopher Nolan does'.