Chris Evans has stepped down from Top Gear after a disappointing first series.

His revamped version of the popular BBC motoring show has come under heavy criticism through his first season at the helm, and he admitted his best efforts were "not enough".

It comes as police confirmed Evans faced a probe over sex assault allegations relating to "incidents in Tower Hamlets in the 1990s." Evans has always denied any wrongdoing.

Today he said on Twitter: "Stepping down from Top Gear. Gave it my best shot but sometimes that's not enough. The team are beyond brilliant, I wish them all the best.

"Full steam ahead then with Radio 2, CarFest, Children In Need, 500 Words and whatever else we can dream up in the future."

In a statement, he added: "I have never worked with a more committed and driven team than the team I have worked with over the last twelve months. I feel like standing aside is the single best thing I can now do to help the cause.

"I remain a huge fan of the show, always have been, always will be. I will continue to focus on my radio show and the allied events it encompasses."

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Mark Linsey, director of BBC Studios on Top Gear said: "Chris is stepping down from his duties on Top Gear. He says he gave it his best shot doing everything he could to make the show a success.

"He firmly believes that he right people remain, on both the production team and presenating team to take the show forward and make it the hit we want it to be. The new series has so far notched up over 30m views in the UK alone and has already been sold to 130 territories worldwide. (sic)"

Host Chris Evans speaks onstage during the Top Gear panel
Chris Evans has stepped down
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Early viewing figures show the final episode of the series pulled in an audience of just 1.9 million, as it found itself in a scheduling clash with covering of the Euro 2016 quarter final match between France and Iceland.

Viewers flocked to Twitter to praise the final episode of the new series, but still laid into Evans for his presenting style, insisting he should be axed to save the show.

Another added: "I reckon if Top Gear got rid of Chris Evans and Eddy Jordan, kept Le Blanc and the other 2 fellas, it'd be a much better show."

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Throughout the series, Evans came under heavy criticism from viewers after failing to impress as the replacement for departing hosts Jeremy Clarkson, Richard Hammond and James May.

He recently admitted he feared for his position, telling Great British Bake Off winner Nadiya Hussain: "I wake up every morning expecting to be sacked by lunchtime. Then when I'm not, the rest of the day is really chipper."

The presenter was allegedly in serious trouble with BBC boss Kate Phillips
Matt Le Blanc, Chris Evans and the Top Gear team at the of the series of Top Gear
Matt Le Blanc, Chris Evans and the Top Gear team at the start of the series
Matt Le Blanc, Chris Evans and the Top Gear team at the of the series of Top Gear
Viewers didn't enjoy his presenting style

It comes after claims the presenter is allegedly in serious trouble with BBC boss Kate Phillips over his "control freak" behaviour on set.

His antics reportedly rubbed the cast and crew up the wrong way and had sparked a string of complaints.

Top Gear boss Kate Phillips is said to be the woman behind breaking Strictly Come Dancing over in the States and so is credited with knowing what it takes to bring a show to a global audience.

Matt le Blanc says a Brexit joke on Top Gear
Cast and crew have allegedly complained about Chris' 'control freak' behaviour
Top Gear 2016
Chris has left the show

She was allegedly looking into making his co-star Matt LeBlanc the programme's star as he is already known across the world.

"Matt is more well-known and popular with audiences, so Chris will take a back seat like he did towards the end of the series," the source added.

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"The other presenters will have a more prominent role and it will be seen as an ensemble rather than Chris and his team."