No Eurostar trains will run to and from Brussels today (Wednesday) due to a national strike in Belgium.
Services to the Belgian capital will only be able to operate to Lille.
Three trains from London St Pancras have been cancelled and four from Lille to London.
A reduced timetable will operate to and from Lille Europe station.
All metro, tram and bus services in Brussels are expected to be cancelled.
No delays are expected at Brussels airport, although public transport to and from the airport faces disruption.