Thousands of Eurostar customers will be affected over the festive period as they have voted for strike action this Christmas.
Members of the Rail, Maritime and Transport (RMT) union who are employed by a private contractor will strike on 16, 18, 22 and 23 December.
More than 100 security staff who are employed by Mitie will strike and the RMT said this will “severely affect” Eurostar services over the pre-Christmas period.
General secretary Mick Lynch said, “Eurostar security staff are essential to the running of Eurostar, and it is disgraceful they are not being paid a decent wage.
“They work long unsocial hours and a multimillion-pound company like Mitie can easily afford to pay them decently for the essential work they do.
“We do not want to disrupt people’s travel plans, but our members need a pay rise, and this is the only way management will listen.
“I urge Mitie and Eurostar to come to a negotiated settlement with RMT as soon as possible.”