Boris Johnson has revived plans to build a £20 billion bridge between Scotland and Northern Ireland with engineers looking to copy the link between Sweden and Denmark which featured in a hit Scandi noir crime drama. The Prime Minister, who is keen to sanction a series of grand infrastructure projects as a legacy of his rule, is about to receive the results of a feasibility study into the construction of a combined bridge and tunnel connection at the narrowest, 20-mile gap between Northern Ireland and the British mainland.