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Thousands of naked cyclists brought London to a jaw-dropping standstill on Saturday - in what's thought to be Britain's largest-ever nude protest.

Committed bike fans stripped off to call for more cycle lanes and bike-only zones to be set up in the capital.

Some of those taking part in the stunt opted for underwear to protect their modesty - but most taking part cast off their clothes entirely, regardless of sticky saddles or stares from passers-by.

Stunned drivers - as well as pedestrians - watched in amazement as the parade of naked flesh blocked key routes in central London.

Amazing pictures show the fleet of bare-skinned men and women - many wearing backpacks with repair kit and other essentials - travelling across Westminster Bridge as hundreds of tourists watch on.

Organisers of the event later posted on their official Facebook account: "That was huge! Thank you to everyone who took part today.

"We don't have an official count yet, but it was definitely the biggest London ride so far."

Incredulous Londoners snapped away on their mobile phones, with hundreds of images ending up on social media.

Passer-by Clare McCarthy Tweeted: "Just seen about 300 naked men cycle past in Covent Garden. My mother felt the need to comment on every buttock."

The event was one of a series of stunts worldwide by cyclists campaigning for more protection on the roads.

Earlier this month, bike enthusiasts in Manchester, York and other cities stripped off for similar events.