The Foreign and Commonwealth Office said there is likely to be some disruption to a number of domestic and international flights in Greece, but said it’s not yet clear which airports or services will be affected.

“If you’re due to travel in this period, contact your airline or travel company for more information,” it said.

Greek civil aviation workers are walking out in protest against the long-term lease of 14 regional airports, planned as part of the government’s privatisation programme to help with the country’s bailout.

Meanwhile, walk-outs today are disrupting public transport services to and from Athens Airport.

The FCO is also warning of continued rail strikes in France and of nationwide protests planned across the country for June 23 and 28.

Strike action by French air traffic controllers has already led to dozens of flight cancellations during the Euro 2016 football tournament.

Following outbreaks of violence, the FCO has warned fans travelling to the Lens/Lille area for the England versus Wales match tonight to be cautious.

Government officials in northern France have banned all takeaway alcohol sales, drinking in public places and the use of all metallic cans and glass bottles in Lille and surrounding areas until 6am tomorrow (Friday).

There is also ban on the sale and consumption of alcohol in all motorway service stations on the A1, A16 and A25.

The FCO said there will be controls at Lille Flandres station today to check passengers boarding trains to Lens and all alcohol will be confiscated.

“These measures will be effective from 30 minutes before the first train leaves until the last train has departed,” it added.