A six-year calm in labor relations at Britain's U.S.-owned auto companies could soon end. At General Motors Corp.'s Vauxhall unit, workers have voted for industrial action, including a strike, if GM doesn't sweeten its offer of a 3.5% pay hike. Labor wants an 11% raise. Ford Motor Co. workers haven't voted yet, but recent wildcat strikes at three plants indicate displeasure with a 4.75% pay increase. Altogether, 30,000 GM and Ford workers could be affected.

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