Prime Minister David Cameron has described Tory MP Douglas Carswell's defection to UKIP as "deeply regrettable" and "self-defeating".
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Officials say wanted Moroccan man Younes Abouyaaquoub was the driver of the van which ploughed into pedestrians in Barcelona last week.
Big Ben will fall silent on Monday for renovations following a backlash from MPs over the proposed four-year timetable for the work.
Rain will push into the northwest, turning heavy and persistent in places