Passengers at Heathrow Airport could be impacted by another round of strikes by border force staff in the coming weeks.

The new dates are four days from August 31 to September 3, which will be followed by another work-to-rule and overtime ban until September 22.

The workers have already taken seven days of strike action in April, May and June, and action short of a strike that included a work to rule and overtime ban.

According to the Public and Commercial Services (PCS) union, which represents around 650 immigration staff at Heathrow’s terminals 2, 3, 4 and 5, the dispute is over enforced changes to rotas put in place since April.

The union said since then around 160 staff have left because of the lack of flexibility and changes to the shifts.

PCS General Secretary Fran Heathcote said: “Our hard-working members at Heathrow take great pride in keeping our country’s border safe, but many are being forced out of the job they love.

“They’re being told by managers to choose between caring responsibilities and their job, which is no choice at all. The only reason they’re being forced to choose is because their managers are forcing them.

“We know our strike action is likely to cause serious disruption to travellers using Heathrow at the end of the summer, but the strike can be avoided if the employer listens to the concerns of our members.”