paragraph_text: Premier Supermarkets, a subsidiary of Express Dairies, opened the UK's first supermarket in Streatham, South London in 1951, though The Co-operative Food opened Britain's first fully self - service store in March 1948 in Albert Road, Southsea.

paragraph_text: The best - known 'first World Expo' was held in The Crystal Palace in Hyde Park, London, United Kingdom, in 1851, under the title ``Great Exhibition of the Works of Industry of All Nations ''. The Great Exhibition, as it is often called, was an idea of Prince Albert, Queen Victoria's husband, and is usually considered to be the first international exhibition of manufactured products. It influenced the development of several aspects of society, including art - and - design education, international trade and relations, and tourism. These events have resulted in a remarkable form of Prince Albert's life history, one that continues to be reflected in London architecture in a number of ways, including in the Albert Memorial later erected to the Prince. This expo was the most obvious precedent for the many international exhibitions, later called world's fairs, that have continued to be held to the present time.

paragraph_text: Imperial's main campus is located in the South Kensington area of central London. It is situated in an area of South Kensington, known as Albertopolis, which has a high concentration of cultural and academic institutions, adjacent to the Natural History Museum, the Science Museum, the Victoria and Albert Museum, the Royal College of Music, the Royal College of Art, the Royal Geographical Society and the Royal Albert Hall. Nearby public attractions include the Kensington Palace, Hyde Park and the Kensington Gardens, the National Art Library, and the Brompton Oratory. The expansion of the South Kensington campus in the 1950s & 1960s absorbed the site of the former Imperial Institute, designed by Thomas Collcutt, of which only the 287 foot (87 m) high Queen's Tower remains among the more modern buildings.

paragraph_text: Miss World 1974, the 24th edition of the Miss World pageant, was held on 22 November 1974 at the Royal Albert Hall in London, United Kingdom. The event was viewed by an estimated 30 million people, and was a "Wide World Special" on the ABC Television Network.

paragraph_text: Albert Chevalier born Albert Onésime Britannicus Gwathveoyd Louis Chevalier; (21 March 186110 July 1923), was an English music hall comedian, singer and musical theatre actor. He specialised in cockney related humour based on life as a costermonger in London during the Victorian era. Owing to this and his ability to write songs, he became known to his audiences as the "costers' laureate".

paragraph_text: Located in the Taliesin building, the Egypt Centre is open to the public. More than 4,000 items are in its collection. Most were collected by the pharmacist and entrepreneur Sir Henry Wellcome. Others came from the British Museum, the Royal Edinburgh Museum, National Museums and Galleries of Wales Cardiff, the Royal Albert Museum and Art Gallery and private donors.

paragraph_text: The British Academy of Film and Television Arts or BAFTA Film Awards are presented in an annual award show hosted by the British Academy of Film and Television Arts (BAFTA) to honour the best British and international contributions to film. The ceremonies were initially held at the flagship Odeon cinema in Leicester Square in London, before being held at the Royal Opera House from 2008 to 2016. Since 2017, the ceremony has been held at the Royal Albert Hall in London.

paragraph_text: Spectre had its world premiere in London on 26 October 2015 at the Royal Albert Hall, the same day as its general release in the United Kingdom and Republic of Ireland. Following the announcement of the start of filming, Paramount Pictures brought forward the release of Mission: Impossible – Rogue Nation to avoid competing with Spectre. In March 2015 IMAX corporation announced that Spectre would be screened in its cinemas, following Skyfall's success with the company. In the UK it received a wider release than Skyfall, with a minimum of 647 cinemas including 40 IMAX screens, compared to Skyfall's 587 locations and 21 IMAX screens.

paragraph_text: The Last Jedi had its world premiere in Los Angeles on December 9, 2017. The European premiere was held at London's Royal Albert Hall on December 12, 2017, with a red carpet event.

paragraph_text: Year Location Venue Presenters 1960 London Royal Festival Hall Katie Boyle 1963 BBC Television Centre 1968 Royal Albert Hall 1972 Edinburgh Usher Hall Moira Shearer Brighton Brighton Dome Katie Boyle 1977 London Wembley Conference Centre Angela Rippon 1982 Harrogate Harrogate International Centre Jan Leeming 1998 Birmingham National Indoor Arena Ulrika Jonsson and Terry Wogan

paragraph_text: The 1988 Wightman Cup (also known as the 1988 British Car Auctions Wightman Cup for sponsorship reasons) was the 60th and final edition of the annual women's team tennis competition between the United States and Great Britain. It was held at the Royal Albert Hall in London in England in the United Kingdom.

paragraph_text: The building housed the department store Derry and Toms until 1973, and then Biba until 1975. Since the 1980s the garden has been used as a restaurant and club.

paragraph_text: The Proms, more formally known as the BBC Proms or Henry Wood Promenade Concerts presented by the BBC, is an eight - week summer season of daily orchestral classical music concerts and other events held annually, predominantly in the Royal Albert Hall in central London, England, UK. Founded in 1895, seasons now consist of concerts in Albert Hall, chamber music concerts at Cadogan Hall, additional Proms in the Park events across the UK on the Last Night of the Proms, and associated educational and children's events. The season is a significant event in British culture. In classical music, Jiří Bělohlávek described the Proms as ``the world's largest and most democratic musical festival ''.

paragraph_text: Another important library – the University Library, founded in 1816, is home to over two million items. The building was designed by architects Marek Budzyński and Zbigniew Badowski and opened on 15 December 1999. It is surrounded by green. The University Library garden, designed by Irena Bajerska, was opened on 12 June 2002. It is one of the largest and most beautiful roof gardens in Europe with an area of more than 10,000 m2 (107,639.10 sq ft), and plants covering 5,111 m2 (55,014.35 sq ft). As the university garden it is open to the public every day.

paragraph_text: As well as being a heritage site, it is still in operation today as the Prince Albert Arts Centre for various visual arts clubs and galleries for exhibitions, including the John V. Hicks Gallery, which features local and regional art exhibitions coordinated by the Prince Albert Council for the Arts. Between 1911 and 1937, the old City Hall helped to house the Prince Albert Public Library in its upstairs rooms.

paragraph_text: The Embassy of France in London is the diplomatic mission of France to the United Kingdom. Located just off Knightsbridge at Albert Gate, one of the entrances to Hyde Park, it is situated immediately opposite the Embassy of Kuwait.

paragraph_text: Presby Memorial Iris Gardens is a nonprofit, volunteer-run living museum specializing in iris flowers, located at 474 Upper Mountain Avenue, Montclair in Essex County, New Jersey, New Jersey, United States. The gardens are situated on 6.5 acres. Adjacent to the gardens is a Victorian house, the Walther House. The house is open to the public and is home to a museum shop and headquarters for the Citizens Committee that oversees the gardens.

paragraph_text: Miss World 1976, the 26th edition of the Miss World pageant, was held on 18 November 1976 at the Royal Albert Hall in London, United Kingdom. The winner was Cindy Breakspeare from Jamaica. She was crowned by Miss World 1975, Wilnelia Merced of Puerto Rico. Runner-up was Karen Jo Pini representing Australia, third was Diana Marie Roberts Duenas from Guam, fourth was Carol Jean Grant of United Kingdom, and fifth was Merja Helena Tammi from Finland.

paragraph_text: Brisbane Festival Hall was an indoor arena located on the southern corner of Albert Street and Charlotte Street, Brisbane, Queensland, Australia.

paragraph_text: The Monument in the City of London provides views of the surrounding area while commemorating the Great Fire of London, which originated nearby. Marble Arch and Wellington Arch, at the north and south ends of Park Lane respectively, have royal connections, as do the Albert Memorial and Royal Albert Hall in Kensington. Nelson's Column is a nationally recognised monument in Trafalgar Square, one of the focal points of central London. Older buildings are mainly brick built, most commonly the yellow London stock brick or a warm orange-red variety, often decorated with carvings and white plaster mouldings.

Question: When did the roof gardens above the city where the Albert Memorial and Royal Albert Hall is located open to the public?
Answer: 1980s