A record £5 million has been bet on Sam and Amanda Marchant to win Big Brother 2007, making them the most popular Big Brother housemates yet.

The bookies stand to lose a fortune if the girls win, as they were first given the odds of only 20/1 when people were sure Brian would win.

Ladbrokes spokesman Nick Weinberg said last night: “The twins will go down in BB history.

They’ve managed to steer clear of all the bitching and back-stabbing which has made them firm favourites amongst the punters. If they’re crowned queens of BB their army of fans will only increase.

“The only people they won’t be popular with are the bookies — we stand to take a hammering.”

He continued: “We’re bracing ourselves for the darkest day in reality TV history. If the twins win it’ll be the worst result since BB began.”