Big Brother housemates are in for a shock this year when they learn of a possible drain on thier prize winnings, the Mirror reports today.

Like last year, each Saturday will see the housemates face a live task, but this year, a failure to complete this will result in a £10,000 reduction of their prize winnings. This means that failing the task every week would result in no prize money.

Producers hope that this possible 'money drain' will be an incentive for housemates to give their all in the tasks.

An insider said: "They always say they are taking part in Big Brother for the experience rather than cash, but this will find out if they are being truthful. It's one thing to lose a challenge and miss out on a treat or two, but it's much more serious when this sort of money is involved."