Redevelopment
In 2008, with the election of a Conservative Mayor of London, plans were drawn up for the redevelopment of the Earls Court Exhibition Centre site, including Lillie Bridge depot and other surrounding land, covering an area of 44 acre. Outline planning consent was granted to the redevelopment "masterplan" by the adjacent Conservative-controlled local authorities in November 2013, and Transport for London made an agreement with Capital and Counties PLC (Capco) to carry out the redevelopment of Earls Court exhibition halls 1 and 2, including Lillie Bridge Depot, as a joint venture, ECPL (Earls Court Properties Limited). Transport for London had been looking at options for the depot since 2010, and had reached the conclusion that the workshops could be relocated to Acton Works, with the Transplant maintenance facilities moving to Ruislip depot. However, there was still a need for stabling of trains at the site, and the intention is to construct a low-level box beneath the new buildings for this purpose. Ashfield House, which has provided office accommodation on the northern edge of the depot site, and since 2010 contained a realistic mock-up of a tube station for staff training purposes, known as West Ashfield tube station, is also to be vacated, with staff redeployed elsewhere, so that the building can be demolished.[5] The consequent reconfiguration of Acton Works may require the Emergency Response Unit to relocate from there to another site.
Following reports in November 2018 that the developers were in talks to sell most of their stake in the giant scheme to a Hong Kong billionaire, the stalemate with Hammersmith and Fulham Council deepened. In February 2019 news emerged that the council was considering a compulsory purchase order for the site to increase the amount and accelerate the delivery of badly needed affordable housing.[6]
As of 2014, the site was used for the stabling of up to ten S7 Stock trains, with three sidings used by Transplant for the stabling of maintenance trains. Departments located at the site were the Maintenance Infrastructure Services, the Track Manufacturing Division, the Track Delivery Unit, Plant Services, which covers workshops and stores, and the site also provided storage facilities for Transplant. Transplant maintenance facilities were in the process of being moved to Ruislip depot. London Underground initially thought that stabling for ten trains would be sufficient, but this was increased to 12, to allow for possible changes in service patterns, and the stabling of an engineering train, such as a rail grinder or a battery locomotive with wagons. Various other locations had been considered for the stabling of trains, but all were ruled out on the grounds of cost and associated risks.
The new stabling box would provide six stabling tracks, each capable of holding two S7 Stock trains. They would be numbered from 1 to 6, from east to west. The facility to allow road-rail vehicles to drive onto the tracks could not be accommodated, and diesel trains would be excluded from using the site because of ventilation problems. In addition, the presence of an engineering train, which may be up to 456 ft long, would reduce the number of S7 Stock trains that could use the facility to ten.
In order to allow the development to take place, a number of buildings of architectural interest on Empress Place, including the former Piccadilly line (1907) engineering headquarters at Nos. 16–18, (currently, Capco's Project Rooms) and other Victorian retail outlets on nearby Lillie Road have been given a certificate of immunity by Historic England, which prevents them being granted listed building status. The certificate commenced on 13 January 2017, and runs for five years.[7] The redevelopment scheme has not been universally popular, with aspects of it being criticised by Sadiq Khan, the Mayor of London. Control of Hammersmith and Fulham Council changed in 2014 from Conservative to Labour, who were unhappy with the deal they inherited, and the housing associations for the two council estates that are due to be demolished continued to oppose the plans, as did the RMT union, who represent workers at the depot,[8] and the Save Earl's Court campaign, a local pressure group.[9]