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| 1955, April 5 |
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| CHURCHILL RESIGNED for reasons of age and health; Sir Anthony Eden, former secretary for foreign affairs, succeeded him. | 1 |
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| May 26 |
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| A national election returned a Conservative government to power with a majority of 67 seats in the House of Commons. | 2 |
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| June 15 |
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| Great Britain and the United States concluded an agreement in Washington to cooperate in the peaceful use of nuclear power. | 3 |
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| Oct |
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| The London Clean Air Act banned the burning of untreated coal. The new law was aimed at preventing a recurrence of the “killer smog” of 1952 and saving the estimated $4.5 million dollars spent annually to repair damage and clean up the effects of soot raining down on the city. | 4 |
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| Dec. 7 |
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| Hugh Gaitskell replaced Clement R. Atlee as leader of the Labour Party. | 5 |
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