NICOLA Sturgeon will tonight say the next Tory leader and Prime Minister could do more damage to Scotland in 18 weeks as Margaret Thatcher and John Major's governments did in 18 years.

The First Minister has described the Conservative contest to succeed Theresa May as "a horror show" and will raise the contest in a major speech in Edinburgh tonight where she will also underline the need for Scotland to become an independent country.

She is expected to say: "Immense damage to Scottish communities was caused by an out-of-touch Conservative Party that governed, unelected in Scotland, for 18 years.

“But now I fear a similarly out-of-touch Tory Party, led by an even more reckless leader, could cause as much damage as Mrs Thatcher and John Major did.

“But while they took 18 years, he, whoever it is, could do as much – or more – damage in just 18 weeks. Because by the end of October, Scotland could be heading for a no-deal Brexit.”

The First Minister will set out Holyrood's record in aiming to improve the lives of people in Scotland with what she says will be the damage that could be caused to future generations by Brexit.

“Throughout the last 20 years – and this is due to members from all parties – the parliament has sought to improve the lives of the people of Scotland," she is due to tell the "Devolution at 20" event, organised by the Reform Scotland think thank.

“I believe the record of achievement is a significant one. And it’s maybe telling that – in the most recent Scottish Social Attitudes Survey – 61% of people trust the Scottish Parliament to act in Scotland’s best interests. For the UK Parliament, the score is 21%. Social justice was central to the campaigns of the 1980s and 1990s which helped to create a Scottish Parliament. That was linked to concern about a democratic deficit."

And she will renew her call for Scotland to be independent.

"Instead of the chaos and dysfunction at Westminster, I believe people want a welcoming, tolerant, internationalist, European, equal, caring Scotland," she will say.

“We can achieve that country if Scotland’s future is truly in Scotland’s hands. That’s why, for all the undoubted successes of devolution, this has to be a time for taking stock.

“Scotland must have the option of choosing a different course. The next six months could offer challenges greater than anything we have seen in the last 20 years. In my view they will inevitably require greater powers for Scotland – indeed the full powers that come with independence.

“But in discussing the shape of those extra powers, and how we gain them, we need to ensure that our debates are thorough, thoughtful and constructive – that we carry as many people as possible with us.

“If we achieve that, we can surpass – rather than simply fulfil – the hopes of 20 years ago. And we can ensure that Scotland’s new song is of a greener, fairer and more prosperous country.”

Her speech will co-incide with a television debate with the Tory contenders following the second round of voting by Tory MPs for their preferred candidate.

Boris Johnson topped the first round with 114 votes.