He said: “There were more Golden Buzzers this year. We have eight. I don’t want to give too much away but there was one Golden Buzzer moment. I think in all the years, I’ve done this show because, you know, it wasn’t really supposed to happen because we run out [of buzzers].”

Cowell continued: “It was kind of chaotic at this moment because the audience really dictated it, they did not let this go [for this act]. They’re not going to leave. So we kind of said you know what, why don’t we just give the audience a Golden Buzzer.”

Read more:

• Britain’s Got Talent reveals first look at new judging panel
• BGT judge Bruno Tonioli wants to play a James Bond villain

Cowell also said that there has never been “a rulebook” for the show, adding: “That’s been the best thing about doing the show!”

Tonioli previously revealed that Walliams sent him a gift on his first day on the show, saying: “I haven’t seen David, but he was the first person to send me a message saying congratulations. He also sent a fantastic bottle of Italian wine to my dressing room on my first day. I thought that was absolute class.”

Former Strictly Come Dancing star Gethin Jones recently responded to Tonioli’s move from that show to BGT, saying that he will “absolutely” to do a good job on the judging panel.

He added: “He’s an entertainer, isn’t he by trade? That’s what he does. So they’re just going to have to try and stop him from getting up and singing himself.”