WORKERS at Britain’s biggest Christmas fair are being exploited by ruthless bosses paying “slave wages”, an undercover Sun probe has found.

Stall bosses at Winter Wonderland in Hyde Park pay staff less than £5 an hour to work 12-hour shifts.

6 The Sun's reporter posed as an unlicensed Russian student Credit: Darren Fletcher - The Sun

Illegal workers without proper employment documents were also able to get jobs without security checks or training.

Our reporter posed as a Russian with a student visa and had a basic English test.

She got a job on a stall run by the Manning’s Organisation, one of Britain’s biggest carnival firms.

She was paid £300 for a 60-hour week serving churros — Spanish doughnut sticks.

6 Adverts for the jobs claimed they would pay between £9 and £12 per hour for a 35-hour week Credit: Darren Fletcher - The Sun

6 Workers were not paid fopr extra hours spent cleaning up after the park had closed Credit: Fame Flynet

But three hours of training and three hours of cleaning after the park closed were unpaid, so it worked out at £4.54 per hour.

The national minimum wage for over-25s is £7.50 per hour. The London living wage is £10.20.

Job ads for the event say pay is between £9 and £12 per hour for a 35-hour week.

One former worker said: “I was disgusted by the pay they offered for the hours — it’s slave wages.”

6 Celebs like Simon Cowell have been spotted at the London Christmas fair Credit: Splash News

6 Selena Gomez was also among the celebs spotted hanging out at the park Credit: Splash News

6 The event in Hyde Park in London is run by PWR Events and The Royal Parks Credit: Fame Flynet

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The annual event in central London is run by PWR Events and The Royal Parks.

Celebs including X Factor boss Simon Cowell and his partner Lauren Silverman are among the two million annual visitors.

Winter Wonderland said contractors are required to carry out relevant checks, to comply with statutory obligations and to ensure staff welfare. They vowed to investigate.

Manning’s did not respond to requests to comment.