The main problem is economic feasibility, even if an ASB would give us for free a hyperspace portal transportrer instantly beaming trucks from Ostend to Ramsgate, even from Amsterdam to London City the problem would be to get enough paying traffic to make up for the monthly electticity bill.
The problem is that due to its proximity, Calais has had a 200 year headstart in having the infrastructure not only to ship goods and people to England but also to get the goods from mainland Europe to their harbour in the first place. The rail connections including high-speed bullettrain lines between Calais and Paris are the best in Europe and have numerous tie-ins with lines to every major French and European city. The same is true for higheays. European integration has only helped its attractiveness so far that even before the Chunnel days, the Belgian sealines between Ostend and Dover kept operating at a loss and only survived because they were ownded by the state-owned Belgian railway system. For everyone not enjoying a state-issued railway discount card, it was just easier and cheaper to drive, even to take the train, to Calais and hop on a ferry there.
In short for a tunnel, bridge or even hyperspace portal between England and anywhere not Calais to make sense, you need a.POD wherr not the UK but France voted to leave the European Common Market. The way ot is now, we don't even know how much of the current traffic to Dover will.be allowed next year, never mind whether ot comes.from Calais or straight out of Berlin by Superman Slingshot System