Postal workers in Weston-super-Mare have agreed to go on strike for the first time in 20 years.
Staff said it was over cuts and being asked to cover sickness and absenteeism.
On Tuesday morning, members of the Communication Workers Union said they would stage a series of one day strikes beginning in August.
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Heavy showers overnight, hail and thunder possible, humid
Heavy showers overnight, humid, thunder possible
The Maltings shopping centre was closed to the public after a small amount of the Novichok substance was found in the area.