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The twist was to fool two housemates into believing they had been evicted, only to be greeted by an empty road and a car transporting them to a hidden bedsit within the 'Big Brother' site. From here they would be able to spy on the other housemates before being reintroduced back into the house at a later date.

However, a Channel 4 spokeswoman confirmed this idea has now been postponed and replaced with the so-called "retribution eviction" following Kitten's three official warnings for bad behaviour, the latest after daubing swear words on a mirror.

The spokeswoman added that the twist could be brought back later in the series.

Last night's show, in which the housemates were told of the retribution eviction, was extended from 30 to 45 minutes and saw audience ratings peak at 5.2m, compared with a 4.9m peak for the previous night's show.

While housemates are set to be shocked by this first eviction made at 'Big Brother''s discretion, viewers are also set to be stunned as tonight's show looks set to be the steamiest yet, as it emerged that Stuart and Michelle may have been the first couple across all five series to have had sex on the show.

As most of the action took place under a duvet, a question mark still remains as to whether the British version of the programme has at last experienced its first "bonk". However, scenes due to be screened on tonight's programme, involving a plea from Stuart to Big Brother to turn the cameras off, are set to leave little doubt in viewers' minds.

In addition to any lucrative media deals Stuart and Michelle may gain following the show, the couple could be in line for a further £100,000 if they did have sex and are prepared to re-enact it on Playboy TV's pay-per-view channels Climax3.

If the pair had been on last year's show they would have been in line for a £50,000 payout from The Sun, payable to the first boy-girl couple to have sex in the house.

The last possibility of a 'Big Brother' bonk came in the third series involving PJ and Jade Goody. Both denied that sex took place.

These latest saucy antics followed a night of debauchery when inhibitions tumbled away during a game of spin the bottle.

During the game, Victor kissed both Stuart and Kitten, Daniel licked chocolate spread off Jason's buttocks, and Vanessa and Emma enjoyed a passionate moment.

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