As Albion and Jim have said, take reasonable precautions, and you’ll be OK.
Don’t stop anywhere near the port. Need a night out before crossing? Take it 4 hours away if you can.
Don’t speed or drive dangerously to avoid clandestines. You will be fined for bad driving.
Suspect you’ve stowaways? Tell the authorities, don’t hook them out yourself. No fine for being a victim of having your secured trailer broken into.
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