This person's most important victory occurred in the first election after the Representation of the People Act, which reduced the voting age to 18. A key issue in that election was the decimalization 
This person's most important victory occurred in the first election after the Representation of the People Act, which reduced the voting age to 18. A key issue in that election was the decimalization of coinage decreed by the eventual loser, but implemented by this politician's government; it rendered both men unpopular and contributed to this man's loss in a subsequent election, where he used the slogan "Who Governs Britain." An event of debatable magnitude in the lead-up to the election of this Prime Minister was a 1968 speech paraphrasing Virgil made by his subordinate Shadow Defense Secretary; that speech led this man to fire its author, Enoch Powell, and was the anti-immigration "Rivers of Blood" speech. For 10 points, name this leader of the British Conservative party from 1965, Prime Minister from 1970 to 1974, and longtime nemesis of Harold Wilson.
This person's most important victory occurred in the first election after the Representation of the People Act, which reduced the voting age to 18.
Sir Edward Richard George Heath