Boris Johnson’s proposal for a bridge or tunnel linking Scotland to Northern Ireland has been rejected by a feasibility study as vastly expensive and fraught with potential difficulties.
Released alongside a wider so-called union connectivity review, which called for investment in road, rail and domestic aviation to better connect the four UK nations, the fixed link report found either a bridge or tunnel would be at the very edge of what could be achieved with current technology.
The estimated cost for the bridge would be £335bn and £209bn for the tunnel, with the latter only able to accommodate trains for safety reasons. It would take at least 30 years for either of the links to open.
A particular problem, which was raised by engineers when
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