A blockade of the port of Calais could still go ahead on Monday - despite reports a protest had been downgraded to a go-slow.

Organisers behind the planned action are reported to have said there has been no agreement to scale back the protest over the town's migrant camp.

There are fears traffic will be gridlocked at Calais and concerns if that happens, Operation Stack may have to be implemented. A spokesman for the owners confirmed that the Manston site was on standby to take HGVs should it be required.

On Friday, French interior minister Bernard Cazeneuve held talks with officials and hauliers to dissuade them from staging a blockade.

It had appeared those talks had reached an agreement not to fully blockade the port.

But a question mark has been placed over that commitment with French media reports saying a blockade will still happen and the plan to ring the port with a human chain was still likely.

The haulier boss organising the protest has told the Freight Transport Association that the blockade will go ahead.

The Road Haulage Association (RHA) said it was disappointed that “despite assurances that the action by Calais hauliers would take the form of a go-slow, this now appears not to be the case".

Its chief executive Richard Burnett says the organisation has spoken to a representative of the French road transport union, the FNTR.

Mr Burnett said: "It seems certain traffic crossing from the UK will find it almost impossible to leave the port as access to the A16 is denied.

"The inevitable repercussions of this will surely mean that the authorities on this side of the Channel will have no alternative but to deploy Operation Stack.

"This will bring yet further misery to hauliers bound for mainland Europe and of course for the people and businesses of Kent."

The French newspaper La Voix Du Nord has also reported the blockade will happen on Monday, with the authorities setting up a crisis centre in the town of Arras.