Kent police said border checks were returning to normal after an operation at Dover port prompted the implementation of Operation Stack and six-hour queues.

Kent police did not disclose the reason behind the sudden checks of all vehicles and passengers exiting the country on 15 and 16 September, but in a statement it said the operation had now been “stood down”.

It added: “Border control checks are now returning to normality.”

Earlier, the port of Dover said it was part of a wider operation in Kent and on all short strait routes and that Stage 1 of HGV queuing system Operation Stack had been implemented on the M20 between junctions eight and nine coastbound:

“We are working with our ferry partners to keep the traffic moving and we would like to apologise for any inconvenience caused to our customers and local community,” it added.

One haulier contacted the magazine to say the operation had “predictably caused mayhem in the port and surrounding roads,” with six-hour queues to check in and “half-empty boats.”