Boris Johnson s plan to build a bridge or a tunnel connecting Northern Ireland and Scotland has been slammed by critics as a fantasy .
The Prime Minister has launched an official review to look at how to improve Union transport connectivity, with a fixed Irish Sea link the headline proposal.
The PM has allocated £20million to develop plans for upgraded rail, road, sea and air links across the UK.
But his political opponents have suggested that pursuing the vanity project bridge or tunnel is a waste of money and that the cash should be spent on improving existing creaking infrastructure.
The proposed link between Northern Ireland and Scotland is the latest in a long line of major infrastructure projects that Mr Johnson has attached his name to.
Boris Johnson proposes Douglas Junction roundabout beneath Isle of Man dezeen.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from dezeen.com Daily Mail and Mail on Sunday newspapers.
A giant roundabout connecting Liverpool, Stranraer, and Lancashire to Larne via the Isle of Man has been billed as an alternative crossing to link Britain and Northern Ireland.