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The cyclist made the sick joke into a microphone just moments after an abuse victim had left many of the audience in tears as she recounted her harrowing ordeal.

As compere Jon Hammond approached Wiggins, who had donated a signed shirt for the auction, his face appeared on a giant video screen as he told Mr Hammond: “You’ve got a posh voice. I like posh voices. S*** me off.”

Last night advisers to the Tour de France legend issued an apology for the crude remark, which Wiggins made at the £300-a-head Firecracker Ball in aid of the Barnardo’s children charity.

Fellow guests said drink had been flowing “extremely freely” at Rudding Park Hotel near Harrogate, North Yorks.

Business director David Parkin said: “Initially there was just stunned silence. It was bizarre and shocking.

“The chap sitting next to me said: ‘Before tonight he was my hero, but not any more.’

“It was completely the wrong time and place to say something like that.

“People were completely disgusted by him.”

Wiggins, who has won four Olympic gold medals including one at London 2012, attended the dinner earlier this month in a personal capacity and is not connected to Barnardo’s charity.

Retired PR agency managing director Malcolm Cowing said: “Bradley’s remarks were at very best completely misjudged. On a stag do maybe, but not at a dinner for victims of childhood sexual abuse.”

A spokesman for the 33-year-old’s management company said: “We’d like to apologise to anyone who was offended by his language.”