It comes amid a wave of industrial action by hundreds of thousands of workers in different sectors.
They will now be joined from 2 to 6 May by 1,000 workers in non-examination roles in the same offices, and interview officers in Birmingham, Corby, Hemel Hempstead, Leeds, Portsmouth, Sheffield and Plymouth from 3 to 6 May.
PCS general secretary Mark Serwotka said the government had "insulted" his staff last week by announcing they will receive a pay rise this year of between 4.5% and 5%.took part in 10 days of industrial action over the Easter periodUnite said the strikes will cause "inevitable disruption and delays" to passengers arriving for the King's coronation because of "Heathrow's stubborn refusal" to make an offer that meets members' expectations.
Heathrow offered striking workers a 10% pay increase in January, but in talks last week it said it had improved the offer with a further £1,150 lump sum this year."We kept Heathrow running smoothly during the first 10 days of Unite's failed industrial action, and passengers can have confidence that we will do so again this time," a Heathrow spokesperson said.
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