Question: The Plymouth City Airport was officially opened by a man that was King of the UK until what year?

full_context: Document 1: George V: George V (George Frederick Ernest Albert; 3 June 1865 – 20 January 1936) was King of the United Kingdom and the British Dominions, and Emperor of India, from 6 May 1910 until his death in 1936.
Document 2: RAF Roborough: RAF Roborough is a former Royal Air Force station in Roborough located 3.8 mi north of Plymouth, Devon which used Plymouth City Airport as their base.
Document 3: Plymouth City Airport: Plymouth City Airport (IATA: PLH, ICAO: EGHD) is a 'mothballed' airport located within the City of Plymouth 3.5 NM north northeast of the city centre in Devon, England at Roborough. The airport opened on this site in 1925 and was officially opened by the future Edward VIII, as Prince of Wales, in 1931. The airport is located close to the city centre and has a modern terminal.
Document 4: Proposed Thames Airport: Thames Airport was a proposed elevated airport during the 1930s that would have been constructed over the River Thames between Westminster Bridge and Lambeth Bridge. Not much is known about the proposed airport, except that it would have had an elevator to bring people to the flight deck, as well as room underneath for a hangar. It would have also been next to the nearby Big Ben and Palace of Westminster.
Document 5: Brymon Airways: Brymon Airways is a former British airline with its head office in the Brymon House on the property of Plymouth City Airport in Plymouth, Devon. It was co-founded in 1972 by journalist Bill Bryce and racing driver Chris Amon.
Document 6: Alexandra Park Aerodrome: Alexandra Park Aerodrome was the second purpose-built aerodrome in the Manchester area in England. The site was chosen by the War Department in 1917 because of its open agricultural nature, and lay between the neighbouring districts of Fallowfield, Chorlton, Whalley Range, Withington and West Didsbury, at the junction of Princess Road and Mauldeth Road West, three miles south of Manchester's city centre: the land was owned by the Egerton Estate. The aerodrome's brief existence is commemorated on a plaque in the sports pavilion at Hough End Playing Fields, which now occupy part of the site. A commemorative plaque was unveiled on 7 July 2007 to mark the 90th anniversary of the aerodrome and is located in the grounds of No. 184 (Manchester South) Squadron, Air Cadets, in Hough End Crescent.
Document 7: List of Prime Ministers of King Edward VIII: King Edward VIII was the King of the United Kingdom and the Dominions and colonies of the British Commonwealth, Emperor of India, from 20 January to 11 December 1936, when he abdicated the throne.
Document 8: Heathrow Terminal 1: Heathrow Terminal 1 is a disused airport terminal at London Heathrow Airport that was in operation between 1968 to 2015. When it was officially opened by Queen Elizabeth II in April 1969 it was the largest new airport terminal in western Europe. At the point of its closure on 29 June 2015 it had only been handling twenty daily flights by British Airways to nine destinations. In May 2017 the entire contents of the terminal was put up for auction. The footprint of Terminal 1 was planned to be used for construction of the second phase of London Heathrow Terminal 2.
Document 9: RAF Mount Batten: RAF Mount Batten was a Royal Air Force station and flying boat base at Mount Batten, a peninsula in Plymouth Sound, Devon, England. Originally a seaplane station opened in 1917 as a Royal Navy Air Service Station Cattewater it became RAF Cattewater in 1918 and in 1928 was renamed RAF Mount Batten. The station motto was "In Honour Bound" which is the motto of the Mountbatten family.
Document 10: 1936 in the United Kingdom: Events from the year 1936 in the United Kingdom. The year is notable for the death of George V early in the year, the accession of his son Edward VIII (previously styled David, Prince of Wales) to the throne, and then Edward VIII's abdication, resulting in the accession to the throne of his younger brother George VI (previously Albert, Duke of York).
Document 11: Edward VIII: Edward VIII (Edward Albert Christian George Andrew Patrick David; 23 June 1894 – 28 May 1972) was King of the United Kingdom and the Dominions of the British Empire, and Emperor of India, from 20 January 1936 until his abdication on 11 December the same year.
Document 12: Edward VIII abdication crisis: In 1936, a constitutional crisis in the British Empire arose when King-Emperor Edward VIII proposed to marry Wallis Simpson, an American socialite who was divorced from her first husband and was pursuing a divorce of her second.
Document 13: Roborough: Roborough is a village in the South Hams of Devon, England. Former home of Plymouth City Airport (and formerly to RAF Roborough), Roborough lies just outside the northern boundary of the city of Plymouth on the main road to Tavistock, and is a popular dormitory village.
Document 14: Edward VII: Edward VII (Albert Edward; 9 November 1841 – 6 May 1910) was King of the United Kingdom and the British Dominions and Emperor of India from 22 January 1901 until his death in 1910.
Document 15: George VI: George VI (Albert Frederick Arthur George; 14 December 1895 – 6 February 1952) was King of the United Kingdom and the Dominions of the British Commonwealth from 11 December 1936 until his death. He was the last Emperor of India and the first Head of the Commonwealth.
ground_truth: 1936