Squatters have occupied a £15 million mansion owned by a Russian billionaire in one of the most expensive parts of London.

The Autonomous Nation of Anarchist Libertarians (Anal) say they have been in the Grade II listed building in Eaton Square since Wednesday. They intend to use it as a homeless shelter and community centre, open to any group that “would disgust the wealthy”.

The property, which was built in the early 1820s and had been used as a language school, is believed to have been empty since Russian oligarch Andrey Goncharenko bought it in 2014.

Mr Goncharenko also purchased three other properties in London in a three year period, including one of the UK's most expensive homes, Hanover Lodge in Regent's Park, which cost him £120 million.

Anal, who briefly opened a squat in Admiralty Arch opposite Buckingham Palace in 2015, announced the occupation on Facebook.

They said in a post: “We're back. We've opened our first squat in Belgravia. We intend to erect an [antisocial]\[discommunity] centre open to all individual groups who wish to unite under one roof.

“If it would disgust the wealthy, you're welcome here.”

The Evening Standard claimed alleged computer hacker Lauri Love, 32, who faces up to 99 years in prison if extradited to the US, was staying in the squat.

However, one of the group at the house said he was no longer at the property and had only been visiting.

Mr Love, who has Asperger syndrome, is accused of stealing data from US agencies including the FBI and Nasa. He is currently preparing to appeal against his extradition to the US, which was signed by Home Secretary Amber Rudd in November.

Squatters allowed at hotel

Members of Anal said on Friday most of the group had gone out to run errands.

A doorman for a neighbouring townhouse told the Telegraph he believed a notice had been tapped to the front door by a bailiff firm. He said one of the squatters had removed it.

A member of the group said: “With this building you can see it's empty and it's falling apart in places and there's dust on the windows.

“The reason we have done this is because it's cold and we have a lot of homeless people in the Victoria area that need shelter.

Margaret Thatcher's Belgravia home yours for £30m Show all 6 1 /6 Margaret Thatcher's Belgravia home yours for £30m Margaret Thatcher's Belgravia home yours for £30m The dining room The layout and design of the formal dining room and interlinking study on the ground floor has been reinstated exactly as Baroness Thatcher had it during her 22 years at the property, providing an impressive link to the property’s historical significance. Savills Margaret Thatcher's Belgravia home yours for £30m The '73' plaque Several features from Baroness Thatcher’s time at the property remain, beginning at its entrance; the inlaid ‘73’ plaque in the doorstep was installed by her in 1991 Savills Margaret Thatcher's Belgravia home yours for £30m The study "If only the walls could talk, one could almost imagine Ronald Reagan and other heads of state sitting with Baroness Thatcher in her dining room,” Richard Gutteridge, Head of Savills Sloane Street office said. Savills Margaret Thatcher's Belgravia home yours for £30m Hallway Leconfield chose Hopton stone flooring for the entrance hall, the same used in the Houses of Parliament. The front door is steel-lined ensuring it is bombproof. Savills Margaret Thatcher's Belgravia home yours for £30m Exterior Chester Square is one of London’s most prestigious and desirable addresses. Plaques on the other side of the square commemorate Matthew Arnold, the poet, and Mary Shelley, the author of Frankenstein Savills Margaret Thatcher's Belgravia home yours for £30m The drawing room The entire first floor of the property is dedicated to the drawing room and library, with views of Chester Square and 3.5 metre ceiling heights. It was often said to be Baroness Thatcher’s favourite room of the house. The relaxed yet luxurious space now also features a pair of original Louis XVI fireplaces and parquet flooring, selected to match the house’s original floor. Savills

“We researched the building before we took it and saw it was owned by this Russian oligarch so we figured the damage caused to him compared to the gains for the homeless community is nothing.

“This is nothing to him but for these homeless people it could stop them from dying, especially with snow on the way apparently.”