the Houses of Parliament (1767), the Custom House (1791), the National Gallery (1864) and the General Post Office (1818). More recent projects include the BBC Broadcasting House in London, which won the "New Build (Modern Non-Load-bearing Stone) Award" in the 2006 Natural Stone Awards. Portland stone has been designated by the International Union of Geological Sciences as a Global Heritage Stone Resource. Memorials Following the First World War, Sir Edwin Lutyens used Portland stone (quarried from the bottom of Wakeham) to construct the Cenotaph in London's Whitehall. Erected in 1920, The Cenotaph commemorates the millions of people killed in this and subsequent conflicts. The RAF Bomber Command Memorial in London's Green Park commemorates the 55,573 crew members of the RAF's Bomber Command who were killed between 1939 and 1945. The gravestones for British personnel killed in the First and Second World Wars were made out of Portland stone. The Commonwealth War Graves Commission use Portland Limestone supplier Albion Stone's Portland Basebed. Portland stone was used for the Armed Forces Memorial in Staffordshire, England. Designed by Liam O'Connor Architects and Planning Consultants, it was completed in 2007 at a cost of over £6 million and bears the names of over 16,000 service personnel of the British Armed Forces killed since the Second World War. Substitution Portland stone is recognised to be of a high quality, but is somewhat expensive. In the case of the refurbishment of the British Museum's central court, the planned Portland stone was controversially substituted with Anstrude Roche Clair stone from France, another similar (but cheaper) oolitic limestone. Cement The term "Portland cement" was coined by Joseph Aspdin who in 1824 patented a hydraulic binder created by burning a mixture of limestone and clay, resembling the previously existing Roman cement and presenting a material which he hoped looked like the famous Portland building stone. See also References Further reading Stuart Morris, 2016 Portland, an Illustrated History The Dovecote Press, Wimborne, Dorset: External links Geology of the Jurassic Coast Mark Godden's feature in Geology Today Architecture in the United Kingdom Geology of Dorset Limestone Stone Building stone Jurassic Coast Tithonian Stage Jurassic System of Europe