Nicola Stugeon told the BBC’s Andrew Marr Show yesterday that Scotland was being “imprisoned against its will”.

Boris Johnson’s charm offensive to save the Union will not include more devolution of powers to Holyrood, a vice-chairman of the Conservative Party has revealed.

Andrew Bowie said any suggestion that transferring more responsibility from London to Edinburgh would settle the constitutional issue was “for the birds”.

Yesterday Nicola Sturgeon told the BBC’s Andrew Marr that Scotland was being “imprisoned in the United Kingdom against its will”, as the government at Westminster ruled out a second independence referendum.

It is understood that senior Scottish Tories are urging Mr Johnson to engage in a much more constructive relationship with SNP ministers to deal with problems in Scotland such as the drug deaths crisis.

A conference brokered by the Home Office on the issue will bring