15-hour tailbacks in UK:

British officials were drafted in to help French border police on Sunday after 15-hour queues built up at the port of Dover due to heightened entry checks.

Stationary vehicles could be seen snaking through the countryside, inland from Dover at England’s southeastern tip.

The town is Britain’s main ferry port to Calais in northeastern France, 21 miles (33 kms) across the Channel.

Under a reciprocal agreement, Britain