Activists from the Autonomous Nation of Anarchist Libertarians were ejected from a £15 million base in nearby Eaton Place yesterday by police and bailiffs.
Within hours they were bringing bedding and furniture into a seven-storey property once owned by the Victorian archaelogist Augustus Pitt-River. It has since been converted into offices.
The group also intend to use the empty mansion next door on Grosvenor Gardens as a community centre for talks, film screenings and events.
He said: “We thought we’d take Eaton Square first because it would be a better starting point but this one turns out to be worth much more. We will get into Buckingham Palace at this rate.
“We’re not here to cause damage and the courts know that.”
The group says it has taken in homeless people to provide them with food and accommodation during the cold winter nights. Mr Fox said: “We have to be a little bit selective about who we help because we don’t want the place turned into a crack den. We’re a family and everyone has to work together.”