By Paul Sandle and Muvija M LONDON (Reuters) -An Atlantic storm battered northwestern European on Friday with record winds of up to 122 miles per hour, killing at least eight people, knocking out power for tens of thousands and shredding the roof of London’s O2 arena. Storm Eunice, which brewed in the central Atlantic and was spun up from the Azores towards Europe by the jet stream, posed a danger to life, Britain’s Meteorological Office said. The storm hit western England, making landfall in Cornwall, where waves lashed the coast, sending plumes of spray over the roofs of cottages, Reuters pi…