Strikes by Border Force staff at UK airports could go on for months unless the government enters talks over pay, the head of the PCS union has said.
Mark Serwotka said the union had a “mandate” for walkouts up until May.
Prime Minister Rishi Sunak said he was “sad” about disruption caused by strikes, but said he had acted “fairly and reasonably” over public sector pay.
Thousands of travellers arriving in the UK have been told to expect delays over Christmas as border staff walk out.
The AA and RAC motoring groups said that Friday would be the busiest day on the roads this week, with an estimated 16.9 million journeys being made across the UK.
Meanwhile, 1,000 Border Force staff – many of whom check passports – are staging the first of a series of strikes from Friday to 26 December and from 28 to 31 December.
Employees are walking out at Heathrow, Gatwick, Manchester, Birmingham, Cardiff and Glasgow airports, as well as the Port of Newhaven. Military personnel and civil servants have been drafted in to cover strikers.
Mr Serwotka said disruption for passengers was an “unfortunate reality” of the strikes but said any anger should be directed at the government, who he claimed had “ignored” the union.
He said the union was raising cash for a strike fund which meant members could “sustain” strikes “for months and after Christmas”.
“Not only could it be six months, I think in January what you will see is a huge escalation of this action in the civil service and across the rest of the economy unless the government get around the negotiating table,” he said.
“In the long term it’s the right thing for the whole country that we beat inflation.”
Separately, a planned 72-hour walkout by Menzies baggage handlers at Heathrow that had been due to start on 29 December has been called off after members of the Unite union voted to accept an improved pay offer.
