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Staff at the biggest civil service union in the country are starting a series of strikes in a row over pay and conditions on the 20th of March.
More than 250 thousand people working at Job Centres, Courts, Airport Customs and tax offices will be effected.
Around 5 thousand people in the Birmingham area are expected to walk out.
Strikers in Birmingham, Shropshire, Dudley, Worcester, Coventry will gather for a rally in Birmingham City Centre at 12:30am