Ant and Dec are "incredibly stressed" about their 'Saturday Night Takeaway' finale.

Ant and Dec

Ant and Dec

The presenting duo are jetting off to Disney Land in the United States to make the last episode in the family fun series and revealed the production staff are terrified they'll have a meltdown due to the souring Florida temperatures.

Dec said: "The big problem is apparently the heat and the humidity because we are on at 3pm in the afternoon Florida time. All the people behind the scenes are incredibly stressed about it."

And their fears are heightened after their 2016 finale - which was filmed on a cruise ship in Barcelona - was blighted by technical difficulties and James Nesbitt disappeared off camera but Ant insisted it wasn't his fault.

He explained the Daily Star newspaper: "It looked as though he was not in the place he was meant to be but it wasn't down to him."

The presenters - whose full names are Anthony McPartlin and Declan Donnelly - previously admitted they have "sleepless nights" when filming their prank videos, in which they play tricks on celebrities.

Dec revealed the pair, both 41, were a bag of nerves when they played a prank on Jamie Oliver - which aired last month - because the "whole thing is ruined" if the unknowing celebrity catches them in the act.

He said: "We start [working on the series] during the summer, so since last summer coming up with ideas of people we want to hit for undercovers - and Jamie Oliver is our first one for tomorrow night, and he's been on our list for a couple of years!"

To which Ant added: "We kind of messed with his day really. Got involved with the photos... and we nearly get caught.

"We have sleepless nights before those things, because if he turned round and saw us then the whole thing's ruined - all those weeks and months of planning."

Elsewhere, the 'Britain's Got Talent' hosts are gearing up to celebrate 20 years of their children's television programme 'SM:TV' next year, and have said they plan to do "something" if they can get fellow presenter Cat Deeley on board.

Dec said: "We are talking about maybe doing something if we can get Cat [Deeley] back from America - she's a big star out in America now - so she might come back if we beg!"