At this point, the live feed of the event was abruptly cut off, prompting presenters on both Sky News and the BBC to scramble to explain to viewers.
BBC host Christian Fraser said: “Oh, I’m sorry about that.
“We appear to have lost the feed there at the Eden Project of the host broadcaster. We will see if we can pick up that speech a little later.”
On Sky News, the presenter immediately turned to a weather forecast, and afterwards explained to viewers: “If you were watching Prince Charles there, we did cross over to Boris Johnson.
“We were hoping to bring you the Prime Minister’s speech following the Prince of Wales but the broadcaster cut off the line.
“So I’m afraid we were left in the dark, like you.”
Viewers took to Twitter to respond to the bizarre disruption, with some labelling it a “snub”.
One person tweeted: “Oh dear someone seems to have cut off the video just as Boris Johnson was about to follow Prince Charles.”
The First Lady Jill Biden was asked earlier today about meeting the Royal Family, ahead of her and US President Joe Biden having tea with the Queen at Windsor Castle on Sunday.
She replied: “Well, we’re hoping to focus, I think, on education.”
“Joe and I are both looking forward to meeting the Queen.
“That’s an exciting part of the visit for us.
“We’ve looked forward to this for weeks and now it’s finally here.
“It’s a beautiful beginning.”