More strikes have been announced by union members in Border Force at Heathrow Airport at the back end of half term.
The strike action will take place on 31 May and 1 and 2 June. It will be followed by three weeks of action short of a strike that will include a work to rule and overtime ban running from 4 until 25 June.
More than 500 members of the PCS (public and commercial services) union said they had written to the Home Office after the previous strike action at the beginning of the month "highlighting the many problems raised with the new roster system".
The union said it expects the walkouts to disrupt passport checks for travellers coming into the UK at Heathrow Airport.
PCS general secretary Fran Heathcote said: "We are keen to resolve this dispute but the Home Office must first put something on the table for our members to consider.
"The Home Office has said it is 'open to discuss' a resolution but it only responded to our request for a meeting after we threatened further action.
"Until it comes back with changes to the roster that will benefit our members then the dispute will continue."
The staff, who work in terminals 2, 3, 4 and 5, took four days of strike action last month.
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