As mayor of London, Boris Johnson backed a project to build a leafy bridge over the River Thames. It was scrapped, but still cost the taxpayer tens of millions of pounds.
Undeterred, and now in No 10, the Prime Minister is, we can reveal, keenly pursuing a far more ambitious project to link Scotland and Northern Ireland.
His allies suggest it could break the impasse which has bedevilled Brexit. His detractors are far ruder about it.
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