It might but they are avoiding the UK more with ferries going direct to the Europe in order to avoid the No tariff barriers your going to get in the UKIt could be used for corridor freight trains from Ireland to Calais though, trains that might be faster than the ferries. So it would not be completly useless even after Brexit.
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Don't forget the Tuna either which are now coming back to British shores according to Farage, of course they are coming back to British Shores because of Brexit.But now they are British cod, so it is important that we keep them happier.