Take your business underground in London – in pictures

A worker passes through part of the disused Down Street underground station. The disused underground railway station, which closed in 1932, was used by wartime leader Winston Churchill for some cabinet meetings in 1932 as his Whitehall bunker was being built. Out of 270 functioning stations in London more than 40 overground and underground stations still exist but are no longer used. Peter Macdiarmid / Getty Images

A Piccadilly line train passes through disused Down Street station. Peter Macdiarmid / Getty Images

A street sign denotes Down Street on May 18, 2015 in London, England. Peter Macdiarmid / Getty Images

A worker passes through part of the disused Down Street underground station. Peter Macdiarmid / Getty Images

Stairs from the platform level are seen in part of the disused Down Street underground station. Peter Macdiarmid / Getty Images

World War Two era writing in the disused Down Street underground station. Peter Macdiarmid / Getty Images

A worker passes through part of the disused Down Street underground station. Peter Macdiarmid / Getty Images

A sign points the way to the street from Down Street underground station. Peter Macdiarmid / Getty Images

A worker passes through part of the disused Down Street underground station. Peter Macdiarmid / Getty Images

A sign points the way to the street from Down Street underground station. Peter Macdiarmid / Getty Images

A worker climbs the exit stairs. Peter Macdiarmid / Getty Images

Transport for London is seeking ideas from businesses that may want to lease some of the 400 square metres available at the disused Down Street underground station.