Harris announced on April 24, 2006, that he would stand down as leader at the party's convention in August.
He stood down as leader in 1962, after problems with the leadership of the Liberal Party.
Thorpe stood down as Liberal leader two months later.
He stood down as leader in November of that year, at the age of seventy.
Aged seventy-five and with his health failing, he stood down as leader of the Labour peers in 1940.
And I am standing down as leader with immediate effect.
He stood down as leader in 2003, one year ahead of schedule.
He announced on May 6 that he would stand down as leader in the autumn.
Richards stood down as leader after he was accused of assaulting a young woman.
Robson stood down as leader in January 1930, and resigned his seat shortly thereafter.