Big Brother surprised the housemates this evening, when an image of a case of cash in the diary room flashed up on the plasma screen in the living room.

Big Brother announced to the group: "In the diary room is £100,000. Big Brother will get back to you."

During the first of tonight's live shows on Channel 4, Davina told viewers: "In one hour that £100,000 will have a brand new owner. And those housemates will think that their money has gone."

Housemates immediately started speculating about what would happen next. Charley said: "This might be a test. Whoever's quick enough to press that button goes in there, gets that money and leaves," she suggested.

Viewers will find out who takes the money in another live show at 9.30 tonight.