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Customs are our own thing to deal with. We can decide if we wish to waive any inspection of goods or bureaucracy of paperwork on international imports.
I suspect it will be a mess but a smaller one than people fear because the govt will just say fuck it, let it all in duty free (as before) until we say so and then start imposing tariffs and restrictions on a categorical basis until it's all done and they have caught up.
The system they use to currently do importation paperwork is called CHIEF and works basically, on trust, with the spectre of random inspections and HMRC audits to keep everyone in line. Something similar can be rolled out pretty sharpish for EU imports too.
It’s interesting advice- according to seemingly everyone who knows about customs January is going to be carnage, deal or no-deal.