Around 1,000 officials at four ports – Dover, Calais, Coquelles and Dunkirk – will strike over 17-20 February. PCS general secretary Mark Serwotka said the action "would impact people returning from their holidays".
A Home Office spokesperson warned travellers to prepare for disruption. The confirmation of further strike action follows two separate walkouts by Border Force officials at six UK airports, as well as Newhaven ferry port, over Christmas and in the run up to new year.
It also comes as upwards of 500,000 people across several sectors, including train drivers and civil servants, prepare to stage mass industrial action on Wednesday (1 February).
