Robert Peel: Home Secretary then Prime Minister twice (Created the police force, Catholics got the right to hold jobs in the public sphere).
William Gladstone: formed and led the Liberal Party, PM four times (secret vote introduced, greatly increased the number of voters, free education for children).
Benjamin Disraeli: 1st Jewish PM in British history, a favourite politician of Queen Victoria. Leader of the Conservative Party, purchased shares of the Suez Canal.