Speaker of the Commons to resign this afternoon
according to reports the BBC can confirm.
11.05: Statement expected at 1430. Full coverage in PM.
1220 UPDATE from PA: "Tory MP Douglas Hogg today announced he will not stand at the next election, following controversy over his expenses."
1235 UDPATE from PA: "Prime Minister Gordon Brown said today no MP who had defied the rules on expenses will be allowed to stand as a candidate for the Labour Party at the next election."
1245 UPDATE from BBC NEWS: "BBC Scotland understands that constituency labour officials in Michael Martin's Glasgow constituency are preparing for a by-election over the summer"
1356 UPDATE from PA: "Scotland Yard will not investigate the leaking of details of MPs' allowances and expenses to the Daily Telegraph newspaper, the Metropolitan Police said today."