and required more terminal space. Terminal 4 was built south of the southern runway, on the site of farm or farms called Mayfields and Mayfield Farm, next to the existing cargo terminal and away from the three older terminals with connections to Terminals 1, 2 and 3 by the existing Heathrow Cargo Tunnel. (Google Earth ground view) Some open land between Staines Road and Stanwell Road is still called Mayfield Farm. 1984: The one-way underground railway loop serving Heathrow Terminal 4 (south of the central terminal area) was added to the London Underground Piccadilly line. Heathrow Central station was renamed Heathrow Terminals 1, 2, 3. 20 April 1984: a bomb exploded in the baggage area of T2, injuring 22 people including 1 seriously. 1986: The M25 motorway opened in 1986 and provided a direct motorway link to much of the country. 1 April 1986: Terminal 4 was opened by the Prince and Princess of Wales, and became the home of the newly privatised British Airways. 1987: The UK government privatised the British Airports Authority (BAA) which controls Heathrow and six other UK airports. Following privatisation, during the late 1980s and 1990s BAA expanded the proportion of terminal space allocated to retail activities and invested in retail development activities. This included expanding terminal areas to provide more shops and restaurants, and routing passengers through shopping areas to maximise their exposure to retail offerings. 1990s March 1994: 1994 Heathrow mortar attacks 7 February 1996: Concorde G-BOAD arrived at Heathrow after crossing the Atlantic from New York in a new record time: 2 hours, 52 minutes, and 59 seconds. May 1997: The planning stage of the Terminal 5 Public Planning Inquiry ended at a total cost of £80m. Testimony was heard from 700 witnesses and 100,000 pages of transcripts were recorded. The consultation process took 524 days; eight years elapsed from the first application to final government approval – the longest ever planning process in UK history. 23 June 1998: The Heathrow Express began providing a railway service from Paddington station in London. A special rail line was constructed between Heathrow and the Great Western Main Line for this service. 2000s 2001: 24 smallholdings west of the Perry Oaks sewage works were obliterated: see Heathrow (hamlet)#Timeline at "After World War I:". September 2002:: Construction of Terminal 5 began. Its first stage (which took 18 months) was the Twin Rivers Diversion Scheme, diverting the