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Denis Thatcher was an English businessman. He was born in 1915 in Lewisham, London. He attended Dulwich College and the Royal Military Academy, Sandhurst. He served in the British Army during World War II. After the war, he worked as a businessman. He was married to Margaret Thatcher, who served as Prime Minister of the United Kingdom from 1979 to 1990. Denis Thatcher died in 2003.