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Dover loses out, because in most European countries, you pay to use a motor way or trunk road or other essential transport facilities, such as Alpine tunnels.
And the revenue is shared out locally and nationally.
In Britain, you just drive through, pay nothing, and so all related expenses to ports, roads, bridges, be it maintenance, or the construction of new facilities (for example T2), is paid for through indiscriminate taxation or borrowing money to be repaid with the interest.
So each day we just lose out, because people in a place of decision do not want to realise that we are possibly the only country in the West where the State is massively centralised with an unaccountable form of revenue and taxation system, which is left to indiscriminate taxation to pay for all expenses.