Operations will "run smoothly" and there will be "no flight cancellations" during the period of industrial action from 25-27 May, the airport said.

It comes as Heathrow urges the Unite union to put its pay offer of a 10% pay increase, a £1,150 lump sum for 2023 and inflation-linked increase for 2024 to their members.

 
Heathrow chief executive John Holland-Kaye said: "Passengers should not be concerned about strike action by Unite over the half-term getaway.

"The 15 days of strike action over the Easter peak and coronation weekends have had no impact on the smooth running of the airport, and passengers have not noticed any difference from the normal great service they expect at Heathrow."

However, Unite countered Heathrow, claiming research revealed the average pay for Heathrow workers has fallen in real terms by 24% since 2017.

Unite regional coordinating officer Wayne King said: "There is absolutely no justification for security officers at Heathrow being paid far less than comparable officers at other London airports.

"Heathrow regularly trumpets how successful it is as the UK’s premium airport so there is no defence in it paying bargain basement wages."