On March 4, 1974, Heath resigned and Harold Wilson again became Prime Minister of the United Kingdom. Harold Wilson again became Prime Minister on March 4, 1974. On March 4, 1974, Harold Wilson replaced former Prime Minister Heath and became Prime Minister of the United Kingdom. In the unprecedented atmosphere of four strikes, British Prime Minister Edward Heath declared that there was a general election on February 28, 1974. The results of the election could not explain the problem, because no political party gained the majority of support. However, when the Liberal Party and the Conservative Party declared a break in the year of joint government negotiations, Edward Heath resigned as Prime Minister, and Harold Wilson announced that he would become Prime Minister on February 28, 1974.