Page last updated at 15:25 GMT, Tuesday, 19 May 2009 16:25 UK

Speaker resigns to 'maintain unity'

Michael Martin has told MPs he will resign as Speaker of the House of Commons on 21 June, following the row over MPs' expenses.

In a terse statement lasting only 35 seconds, he said that his decision was so that "unity can be maintained". Mr Martin will also stand down as an MP, prompting a by-election in his Glasgow North East seat.

He is the first Speaker in more than 300 years to be forced out of his job.

Nick Robinson reports.

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