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by toast0 1973 days ago
England is an island in geography, but it has a lot of truck (lorry) traffic to and from the continent, via ferries and the rail line under the channel. It's not just containerized freight, the trucks with drivers drive on and drive off the other modes of transit.

Being an island isn't required; you need effective border controls, and effective control of population behavior. It's just a lot easier to have effective border control with an island; but England certainly didn't make use of that possibility.