There has been more serious disruption for people seeking to cross the English Channel via Calais after striking ferry workers again forced the French port to close.

It led to long jams on approach roads in northern France, including the A16 motorway as lorry drivers had little choice but to wait.

In England too thousands of vehicles have also been stuck on the M20 motorway approaching Dover.

However the Channel Tunnel has remained open on Wednesday, unlike the previous day when it was blocked for three hours.

Drivers have been advised to defer their journeys and seek alternative routes.

Calais Port closed due to Industrial Action out of our control Currently no ships movements in Port….. .1/2..— P&O Ferries Updates (@POferriesupdate) July 1, 2015

The workers from MyFerryLink are trying to prevent job cuts after the firm was sold to a Danish group – and a serious escalation of the dispute is now threatened.

“We will block motorways approaching the tunnel for 48 hours by