Two pranksters managed to break into the Big Brother house in one of the television programmes’ biggest security breaches to date.

YouTubers Ally Law and Ryan Taylor uploaded footage to their Snapchat accounts as they recorded housemates at the Elstree studios house in Borehamwood on Friday night.

One clip captures housemates Ashley James and Ann Widdecombe in conversation at the house while the pranksters can be seen peering through a hole as John Barnes, Jonny Mitchell, and Dapper Laughs, chat in another room, in the 21st series of Celebrity Big Brother.

A separate clip from their footage shows Mr Law dressed in a fluorescent jacket suggesting they may have been able to disguise themselves as workers.

The YouTubers, who boast more than 1.2 million subscribers between them, are famous for their daring stunts, which have included breaking into London’s National Theatre and the O2 arena, as well as climbing one of the tallest bridges in England, the Humber Bridge, near Hull.

Mr Law tweeted on Friday night after the break-in: “Tonight was a madness!! There will be no video but I promise it will make sense soon, stay tuned.”

He later changed his mind saying a video will be coming, but it is yet to appear on their channel.

A spokeswoman for Big Brother said: “On Friday night, two intruders were apprehended by security at Elstree Studios. The safety of housemates, production and audience members is of paramount importance and Big Brother has appropriate security measures in place at all times.”