 The site passed into the hands of British Gas Plc in 1973 and subsequently to National Grid plc.At the time of a site survey in connection with the proposed biofuel power station in 2007 three of the site's five gas holders (Nos 3 to 5) remained in use, one (No 1 from the 1860s) was disused and one (No 2 from 1878) had been demolished.Parts of the site were used as long-stay parking for Heathrow Airport during the early 21st century.