Related: Queues at Dover as Easter getaway underway
Ferry passengers at the Port of Dover faced delays of up to an hour on Saturday due to IT issues affecting French border controls.
The disruption began on Saturday morning, coinciding with the peak Christmas getaway period, which is expected to be the busiest on record.
The Port of Dover is working with partner agencies to resolve the problems and has advised passengers not to arrive more than two hours before their sailing.
P&O Ferries noted large queues on approach roads but smooth check-in once passengers reach the port, urging customers to allow extra travel time.
An estimated 37.5 million leisure car trips are planned across the UK between Wednesday and Christmas Eve, prompting advice for careful planning and patience.