Bargain hunters and tourists face disruption if they attend the traditional Boxing Day sales in London on December 26 after underground train drivers announced Monday they would strike over pay.
Members of the Aslef union will walk out for 24 hours on December 26, which is likely to affect London Underground services across the British capital.
The move was announced after Aslef members voted by a nine-to-one ratio in favour of strikes in a long-running row over extra pay for working on national holidays.
"This result shows the strength of feeling among our tube driver members,’ said Aslef general secretary Mick Whelan.
It is the third year in a row that London Underground drivers have gone on strike in a dispute which dates back to an agreement in 1992.
Shoppers flock to London on December 26, when stores slash prices on major items. It is traditionally one of the busiest days of the year for the retail sector in the city.