The third incident in recent months came in the dating show, which featured a woman trying to identify gay men from a selection of male suitors, in order to win a cash prize. It was originally broadcast on Friday evenings after the watershed.
However, Channel 4 decided that it would also be suitable for its youth strand T4 on the weekend, and it was broadcast on Saturday mornings in an edited version suitable for younger audiences.
Nine viewers complained about the episode broadcast on April 9, where the word "fuck" was accidentally included. Some viewers also felt that the subject was unsuitable for the timeslot.
Although Channel 4 apologised for the swearing on air immediately after the programme and explained that it had been left in the Saturday broadcast because of human error, Ofcom ruled that Channel 4 was in breach of the programme code.
It said in its ruling that it welcomed the apology.
"Nonetheless, there have been recent complaints about swearing in a pre-watershed repeat of the 'Big Brother Panto' and in the subtitles of '100 Greatest Christmas Moments'. We are concerned therefore at this latest instance and have concluded that it was in breach of the Programme Code," it said.
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