My apologies! I should've said that this is what the
processes hosted at the likes of Motis and Stop 24 do for a living. And, indeed, those at Immingham, Portsmouth and Felixstowe too.
"There is no compulsion for any incoming freight to go though their books." Correct, ie. when goods are moving under Transit.
I do try to address facts, hopefully with some success (Pablo and Mr Barrington need not respond!

)