Britain's Got Talent judge Amanda Holden shared details of the do's and don'ts ahead of a special live broadcast with Prince William, alongside her co-host Jamie Theakston10:53, 20 May 2026Amanda Holden has said there is one word she and Jamie Theakston are not allowed to use when referring to Prince William, ahead of a special broadcast with the future monarch on Heart Radio this week.‌The 55-year-old and her co-host Jamie Theakston, 55, will be joined by the royal live from Cornwall’s Isles of Scilly on Friday (May 22), as he officially opens a new facility to increase medical capacity and improve access to healthcare across the islands.‌Announcing his visit in a pre-recorded message on the pair's Breakfast Show on Tuesday (May 18), he said: "Hi Jamie and Amanda, I’m heading down to the Isles of Scilly, off the coast of Cornwall, on Friday, to see some of the terrific work going on there to support the local community. I’m also opening the new wing of the hospital in St Mary’s, which will be a fantastic moment.‌"Amanda, I know how fond you are of Cornwall, and the Isles of Scilly, so, it would be really lovely, if you could both come along. Have a great morning guys and I very much look forward to seeing you on Friday. Bye!".Ahead of the visit, Amanda and Jamie were joined in the studio by etiquette expert William Hanson, and they took the opportunity to ask for advice on how they should behave around the royal.‌Sharing her expectations of the Prince, the Britain’s Got Talent judge said she believed he is a "relaxed, unassuming person, who is up for a laugh" and shared hopes of cooking with him in the kitchen.Jamie then asked the etiquette expert whether Prince William should be addressed as ‘His Royal Highness’, to which he replied: "That would be correct and then 'Sir' after that."In response, Amanda said they had been told otherwise. "But then we've been steered away from Sir, he doesn't want to be called Sir," she claimed.‌William added: "He might say, 'Call me William' and if he says, 'Call me William', that's absolutely fine. But for anyone else, almost start off more formally and then drop it down accordingly."Later in the show, Amanda revealed she and Jamie had also been advised to be "very chilled and relaxed" when they meet the Prince.‌Asked by a listener what she was planning on wearing, the presenter replied: "I'm going to be honest, we're going to keep it quite casual because we're going to be [by the sea]. I might not even wear a heel, I might wear a sort of trainer just in case I have to run around."I'm going to get Prince William into the kitchen," she declared. "So I feel like I might need to have a pinny, all kinds of things are going through my head. The poor man doesn't know what he's let himself in for."Prince William holds a range of titles, including Prince of Wales and Duke of Cornwall. In 2020, he joked about how he prefers to be addressed during an appearance on That Peter Crouch Podcast.Article continues belowWhen host Chris Stark asked: "What do we call you by the way? This is what I'm already struggling with," William replied: "Your Royal Highness will do," before laughing, shaking his head and adding: "Just to clarify, it's William. I'm joking."