Billions of pounds will be spent on improving road and rail links to Scotland under plans being put forward by Boris Johnson to strengthen the Union, it was claimed today. The Prime Minister is said to be preparing to splash the cash on better infrastructure in a desperate bid to see off the threat of Scottish independence. The Government is also looking at treating Scottish NHS patients on beds in England to deal with an operations backlog while UK diplomats in foreign capitals will be told to stress the case against independence. The plans could also see a student exchange programme set up between the UK nations.