The Government has warned of disruption caused by the latest Border Force strike action this week.
Members of the Public and Commercial Services (PCS) Union are walking out on 15 and 16 March in a dispute over pay.
This could cause delays at UK border control at ports and airports.
The Government claims it has “undertaken extensive planning to minimise disruption, reduce queues and keep our border safe ahead of Border Force strike action”.
Hundreds of people from across government and the military have been drafted in to carry out essential checks at the border, as well as to detect harmful goods and safeguard vulnerable individuals, it said.
A statement said: “Border Force has been working closely with port operators and carriers to ensure we have robust plans in place to minimise any delays to travellers and goods entering the UK if strike action goes ahead.
“In France, several unions have called for strike action and demonstrations on Wednesday 15 March.This industrial action may lead to additional disruption to services and queues at French ports not due to Border Force strike action.”

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Steve Dann, Border Force Chief Operating Officer, said: “It is disappointing that yet again strike action may cause disruption to travellers entering the UK.
“Border Force’s number one priority to is keep our citizens safe and borders secure. We are working closely with port operators and partners across the travel industry to meet critical demand and support the flow of passengers and goods through our border.
“During this period of industrial action, travellers should be prepared for disruption. We encourage everyone to check the latest advice from operators before travelling.”