A reality TV star’s sister who ran the marathon for charity has been accused of cheating.

Natasha Argent, of Woodland Way, Woodford Green, teamed up with her brother James 'Arg' Argent earlier this month to raise money for London Youth before she ran the London Marathon on Sunday (April 24).

But discrepancies in her race data have prompted an investigation by the organisers to see if she cheated.

On Virgin Money’s London Marathon website, the 28-year-old’s times for the 25, 30, and 35km checkpoints are missing.

The data also implies she ran the second half of the race in under 50 minutes, which is a pace of three minutes and 52 seconds a mile.

On Monday her nominated charity London Youth said: “We are aware of the allegations against a #LondonMarathon runner re chip discrepancies & have notified #VMLM2016 who are looking into it.”

The charity works with young people across London to get them engaging with their community through sport.

Miss Argent’s fundraising page shows she has raised £610 for them.

Her brother James, star of The Only Way Is Essex, completed the marathon in just over six hours in 2012, raising £3,308 for Cancer Research.

She has been contacted for comment.