Hey, not sure if this is the right place but I know its been a while since we had alternate PMs and Presidents but why not post your own list of alternate PMs or Presidents.
Heres mine for the UK.
1922: H.H. Asquith (Liberal)
1923: Stanley Baldwin (Conservative)
1924: H.H. Asquith (Liberal)
1929: David Lloyd George (Liberal)
1931: Arthur Henderson (Labour)
1935: Clement Attlee (Labour)
1945: Archibald Sinclair (Liberal)
1950: Clement Attlee (Labour)
1951: Clement Attlee (Labour)
1955: Clement Attlee (Labour)
1959: Anthony Eden (Conservative)
1964: Harold Macmillan (Conservative)
1966: Harold Wilson (Labour-Liberal Coalition)
1970: Harold Wilson (Labour)
1974 (Feb): Edward Heath (Conservative)
1974 (Oct): Edward Heath (Conservative)
1979: Roy Jenkins (Labour)
1983: David Owen (Labour)
1987: David Owen (Labour-Communist Coalition)
1992: Robert Sheldon (Labour-Socialist-Liberal Coalition)
1997: Arthur Scargill (Socialist)
2001: Arthur Scargill (Socialist)
2005: David Trimble (Conservative)
2010: George Osborne (Conservative)
Heres mine for the UK.
1922: H.H. Asquith (Liberal)
1923: Stanley Baldwin (Conservative)
1924: H.H. Asquith (Liberal)
1929: David Lloyd George (Liberal)
1931: Arthur Henderson (Labour)
1935: Clement Attlee (Labour)
1945: Archibald Sinclair (Liberal)
1950: Clement Attlee (Labour)
1951: Clement Attlee (Labour)
1955: Clement Attlee (Labour)
1959: Anthony Eden (Conservative)
1964: Harold Macmillan (Conservative)
1966: Harold Wilson (Labour-Liberal Coalition)
1970: Harold Wilson (Labour)
1974 (Feb): Edward Heath (Conservative)
1974 (Oct): Edward Heath (Conservative)
1979: Roy Jenkins (Labour)
1983: David Owen (Labour)
1987: David Owen (Labour-Communist Coalition)
1992: Robert Sheldon (Labour-Socialist-Liberal Coalition)
1997: Arthur Scargill (Socialist)
2001: Arthur Scargill (Socialist)
2005: David Trimble (Conservative)
2010: George Osborne (Conservative)