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By Tom Symonds & Zoe Conway
BBC News
A senior Border Force official has warned airline and port passengers to expect disruption over Christmas due to planned strikes by staff.
Steve Dann, chief operating officer, said he hoped to keep all airports and ports open as about 1,000 Border Force workers walk out over pay.
Staff will strike on 23-26 and 28-31 December affecting arrivals to the UK.
Heathrow, Gatwick, Glasgow, Edinburgh, Manchester, Birmingham and Cardiff airports will be impacted.
Staff at the port of Newhaven will also strike. All strikers are members of the Public and Commercial Services Union which balloted for strike action after it said the government had refused to increase a 2% pay rise offer.
"In anticipation of the strike action, Border Force has for a number of months undertaken extensive planning, and we've been working with the travel industry and continue to work closely with all UK ports to assess the impacts of the announcement on the travelling public," Mr Dann said.
"We do have robust plans in place to minimise delays to passengers, but we've been very clear from the start that people should be prepared for disruption and take action to plan ahead."
Earlie this month, Home Secretary Suella Braverman said people should "think carefully" about their travel plans on strike days as "they may well be impacted".
Military personnel, civil servants and Home Office volunteers have been trained to check passports when Border Force staff walk out.
But the PCS has said the replacement workers standing in have been given insufficient training.
The union said its officers get five weeks training to do their jobs yet the stand-in staff have been given one week's training.
It claimed civil servants from the National Crime Agency had been "trained at the last minute", with one day's training.
"You can't seriously expect people who have been trained for a day, or even a week, to do the job of officers with five weeks' training and many years experience," a PCS spokesperson said.
But Border Force managers believe they can maintain the same standards as normal for passport checks, and Mr Dann said safety and security at borders will be "non-negotiable".
Officials have refused to disclose the number of replacement staff or the length of training they have received.
Christmas break affected
It is the first Christmas since 2019 that airlines have been able to operate without Covid restrictions and up to two million passengers are expected to arrive between 23 and 31 December at the airports where the strikes will take place, according to aviation analytics firm Cirium.
It has previously said more than 10,000 flights are scheduled to arrive at Heathrow, London Gatwick, Manchester, Birmingham, Cardiff and Glasgow airports during the period.
Travel expert and commentator Simon Calder said he was concerned about whether staff will be able to cope with the rush of early morning passengers at Heathrow airport on Friday, as the Christmas getaway begins.
Mr Dann urged passengers to use the automated electronic passport gates at airports if possible.
The BBC understands that the Border Force asked airports that are expecting passenger numbers on strike days to be above 70-80% of 2019 levels to "supress demand".