Eurostar has pre-emptively cancelled more than 30 London services this week due to ongoing national strike action in France.
In total, 31 trains to and from London have been axed between Wednesday and Friday (11-13 December), mainly London-Paris services.
Trains to and from Brussels and Amsterdam have also been affected by the strikes, which got under way last week.
French signal workers are among those striking, impacting Eurostar services. Eurostar staff are not involved in the action.
Eurostar has advised passengers to check the status of their train before travelling to their departure station.
“The strike action will impact our ability to deliver the usual timetable as we expect disruption to signalling along all routes,” said the operator in a statement. “As a result, we will now run a reduced timetable until 13 December.”
Passengers booked to travel on an affected train can exchange their ticket for another service or claim a full refund.
Eurostar though has warned exchanges will be “very limited” and has advised passengers to travel outside the strike period, where possible.
The strike has also shut down the vast majority of Parisian Metro services, while much of France’s longer-distance domestic rail services are also impacted.
The Foreign Office has warned British travellers to check the status of their travel before setting off.
“Significant industrial action is continuing across France,” said the FCO in its latest bulletin. “This is primarily affecting transport and public services, with ongoing cancellations and severe delays to train, metro, bus and tram services.
“Further disruption and cancellations to Eurostar services between London St Pancras and Paris Gare du Nord have also been announced. Other international rail services such as those to the Netherlands, Belgium, Italy and Germany may also be affected.
“If you’re due to travel, you should check the website of your transport provider for the latest information before you set off.”