Campbell resigns as Lib Dem leader

Sir Menzies Campbell has resigned as Liberal Democrat leader, it was announced tonight.

The shock move was announced by the party president, Simon Hughes, and the deputy leader, Vincent Cable - fuelling speculation that Sir Menzies had been forced out.

In his letter of resignation, released shortly after the announcement, Sir Menzies said: "It has become clear that following the prime minister's decision not to hold an election, questions about leadership are getting in the way of further progress by the party. Accordingly, I now submit my resignation as leader with immediate effect."