Question: When was the British Conservative politician died who's health never fully recovered after the botched operation on Foreign Minister in 1953?

Context paragraphs:
Intrepid RM-1: The Intrepid RM-1 (also known as the Intrepid GTP or Chevrolet Intrepid) is a sports prototype racing car designed in 1991 by Bob and Bill Riley and built by Pratt & Miller to IMSA GTP specifications.  Powered by a Chevrolet V8 engine, it was campaigned variously by Jim Miller, Prototype Technology Group and Wayne Taylor in the IMSA Camel GT from 1991 through 1993.  Though it won only one race in its three seasons of competition, the shovel-nosed Intrepid was notable for the extreme—and at one point, disastrous—levels of downforce it generated, giving it the highest cornering speeds of any prototype of its era.  The car's development was set back by a devastating 1991 crash at Watkins Glen that critically injured driver Tommy Kendall, and the program never fully recovered.

Anthony Eden: Robert Anthony Eden, 1st Earl of Avon, (12 June 1897 – 14 January 1977) was a British Conservative politician who served three periods as Foreign Secretary and then a relatively brief term as Prime Minister of the United Kingdom from 1955 to 1957.

Later cricket career of Jack Hobbs: Sir John Berry "Jack" Hobbs (16 December 1882 – 21 December 1963) was an English professional cricketer who played for Surrey from 1905 to 1934 and for England in 61 Test matches between 1908 and 1930.  Having established himself as the best batsman in the world before the First World War, Hobbs resumed cricket in 1919 and was immediately successful in County Cricket.  He successfully toured Australia with the Marylebone Cricket Club (MCC) in 1920–21 but sustained an injury which affected his batting on that tour and in the subsequent English season.  Also in that 1921 season, he fell seriously ill with appendicitis; the effects of the illness and subsequent operation affected his batting for several seasons and his stamina never fully recovered.  When he returned from the illness, Hobbs was a far less attacking batsman than he had been in his earlier career, but was much more secure and assured.  As a result, his performances were statistically better than before 1914 and his reputation among the public grew.  Adulation for Hobbs reached its peak in 1925 when he broke W. G. Grace's record for most first-class centuries, and the following season he made a century in extremely difficult batting conditions which was instrumental in England winning the Ashes.  At this time, he also established extremely effective opening partnerships—with Herbert Sutcliffe for England and Andy Sandham for Surrey.

Horace Evans, 1st Baron Evans: Horace Evans, 1st Baron Evans (1 January 1903 – 26 October 1963) was a Welsh physician who served the royal family of the United Kingdom.  Historian Peter Hennessy says, "he was probably the leading general physician of his generation."  However, he was involved in the botched operation on Foreign Minister Anthony Eden in 1953, from which Eden's health never fully recovered.

Walter Heiman: Walter J. Heiman (March 12, 1901 in Essen, Germany – March 18, 2007 in University City, Missouri, United States) was a Jewish American man who at the time of his death had become one of the last surviving veterans of the First World War.  Born and raised in Germany, he enlisted as a private in the German Luftstreitkräfte in March 1918, at 17 years of age, after finishing high school.  He was sent to an air base in Hanover for flight training, but the war ended before he finished training.  He talked vividly about the situation by explaining that the German Revolution broke out on November 9, 1918, which caused Kaiser Wilhelm II to abdicate and flee the country, and since at that point in time each soldier made his own decision about his immediate future, Walter decided to go home to Essen.  After the Armistice, the city of Essen was occupied by the French Army.  Walter's older brother Kurt had also served in the German Army earlier in the war and was wounded in 1916 at the Battle of the Somme.  Kurt never fully recovered from his wounds that he suffered in the battle and died in 1920.

Nunzio Gallo: Nunzio Gallo (25 March 1928 – 22 February 2008) was an Italian singer.  He was born in Naples and represented his country in the 1957 Eurovision Song Contest, coming 6th.  The song he performed, "Corde Della Mia Chitarra", is famous for being the longest song ever played for Eurovision at 5:09 before the new rules came into place.  Gallo was also an actor appearing in over 20 films.  Gallo suffered severe brain haemorrhage in September 2007 from which he never fully recovered.  He died on 22 February 2008 in Telese Terme.

Greg Robinson (running back): Greg Robinson (born August 7, 1969 in Grenada, Mississippi) is a former professional American football player who played running back for three seasons for the St. Louis Rams and the Los Angeles Raiders.  He led the Raiders in rushing in 1993, gaining 591 yards in 12 games, before suffering a serious knee injury against the Buffalo Bills.  He sat out the rest of the 1993 season and all of 1994 before coming back with the Rams.  Robinson never fully recovered from his knee injury and retired after the 1998 season.

Makina Kameya: Makina Kameya (died February 1988) was an Angola-born Zimbabwean sculptor.  An ethnic Mbundu, who spoke Portuguese and English, he moved to Zimbabwe in the 1960s, and spent most of his career at the Tengenenge Sculpture Community, where he died, having never fully recovered from severe injuries incurred when one of his sculptures fell and crushed his pelvis and legs.  His works are on display at the Chapungu Sculpture Park.

Pickett's Charge: Pickett's Charge was an infantry assault ordered by Confederate Gen. Robert E. Lee against Maj. Gen. George G. Meade's Union positions on July 3, 1863, the last day of the Battle of Gettysburg in the state of Pennsylvania during the American Civil War.  Its futility was predicted by the charge's commander, Lt. Gen. James Longstreet, and it was arguably an avoidable mistake from which the Southern war effort never fully recovered militarily or psychologically.  The farthest point reached by the attack has been referred to as the high-water mark of the Confederacy.

Nico Rijnders: Nico Rijnders (30 July 1947, Breda - 16 March 1976) was a Dutch footballer who played for NAC Breda and Ajax Amsterdam and was part of their European Cup victory in 1971.  He earned 8 caps for the Netherlands national football team.  He collapsed on 12 November 1972 while playing for Club Brugge against RFC Liège and was clinically dead when he was transported off the pitch, he was successfully reanimated by the club doctor but the incident ended Rijnders' playing career.  His health condition was never fully recovered and he died three years later, aged 28.

Supporting paragraphs: Horace Evans, 1st Baron Evans Anthony Eden
Answer: 14 January 1977