Eurostar has cancelled a number of trains to and from Paris, Lille and Brussels today as French railway workers begin three months of rolling strikes.
Cancellations are also expected tomorrow.
Eurostar passengers with tickets for cancelled services over the next two days are being offered an alternative trip or a full refund.
The cross-Channel train operator is also warning passengers making onward journeys in France over the next two days that French domestic rail services will be disrupted by the SNCF strikes.
The industrial action, called in protest at French president Emmanual Macron’s attempts to modernise the country’s economy, are also likely to disrupt services throughout the rest of the spring and into early summer.
Unions plan to strike for two days in every five in an attempt to force Macron to re-think plans to shake up the SNCF rail monopoly and open it up to competition, as required by EU law.
Those who have booked connecting journeys in France and wish to cancel or change their bookings should contact Eurostar.
The rail operator said requests would be fulfilled subject to availability.
As a consequence of the strike today and tomorrow, trains to Disneyland Paris have been re-routed.
They will now depart at 10:14 from London, 10:34 from Ebbsfleet and 10:58 from Ashford and will arrive in Paris instead at 14:03 instead of Marne-la-Vallee with a scheduled stop in Lille.
The return trains will depart from Paris Gare du Nord instead of Marne-la-Vallee.
In a statement Eurostar said: “We’re very sorry for the inconvenience that this will cause you.
“We will contact passengers with journeys booked to travel on days affected as soon as we receive the details of the implications of the SNCF strike on Eurostar.
“We will endeavour to provide you with as much advance warning as possible to enable you to rearrange your travel plans.”
See a full statement on the changes here.