Station staff working for the rail operator Greater Anglia have voted to go on strike in a row over flexible working.
Members of the Rail Maritime and Transport Union on the West Anglia route backed a campaign of industrial action.
The union has about 100 members involved in the dispute. Its General Secretary Bob Crow has accused Greater Anglia of ignoring agreed procedures.
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After a sunny start, cloud will tend to increase from the northwest during the day, but it will stay dry.
Heavy rain in places which will clear away to the east by late evening.
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