Nicola Sturgeon has accused Theresa May of a "dereliction of duty" in failing to set out the economic impact of Brexit as the Scottish Government prepares to publish its own analysis.

The Scottish Government report will suggest the cost of a so-called 'hard Brexit' to Scotland could reach £12.7bn a year.

The First Minister said the study will make clear that remaining in the European single market and the customs union would be the least damaging option for the economy.

The paper comes as the SNP and other opposition parties ramped up their campaign to prevent a hard Brexit, with pressure mounting on Labour join in.

The UK Government has already made it clear it will seek to take Britain out of the single market and pursue a bespoke trade deal with the EU.

The Scottish Government's study, to be launched by Sturgeon in Edinburgh, looks at the impact of three different Brexit outcomes on GDP, trade and immigration.

These include staying in the single market and customs union, a preferential trade agreement or reverting to WTO (World Trade Organisation) terms.

The latter option - hard Brexit - would cost Scotland around 8.5% of its GDP according to the paper.

This would be the equivalent of £12.7bn a year by the year 2030, or around £2300 per year per person in Scotland.

Brexit Secretary David Davis told MPs last month that the UK Government had not carried out any impact assessments of leaving the EU on the UK economy.

He said "sectoral analysis" of different industries had been drawn up, but not a "forecast" of what would happen after Brexit.