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10 November 2010, 10:19 | Updated: 10 November 2010, 10:23
Tube drivers are voting on industrial action in a row over Boxing Day pay, threatening fresh disruption to passengers.
Aslef says managers insist December 26th is a normal working day, but the union says its members should receive additional pay.
London Underground says it has a long-standing agreement to cover staff working arrangements on Boxing Day.