Decision motivated by ‘conflict over Brexit’ and desire to spend time with her partner and son

Ruth Davidson has quit as leader of the Scottish Conservatives, citing both the conflict she feels over Brexit and her desire to achieve a better balance between her working and family life.

Telling a press conference in Edinburgh that she had made the decision with a heavy heart, Davidson described leading the party since November 2011 as “the privilege of my life”.

The loss of Davidson, the Scottish Conservatives’ most successful leader since devolution, from frontline politics will be a considerable blow not only to the party but also to the pro-union cause.

Davidson, who gave birth to her first child in October, confirmed that she would continue as MSP for Edinburgh Central until 2021, but said “the threat of spending hundreds of hours away from my home and family [to fight another election] now fills me with dread. That is no way to lead.”

She added: “You all know I have never sought to hide the conflict I have felt over Brexit. Despite that conflict, I have attempted to chart a course for our party which recognises and respects the referendum result.”

Parliament suspension: Ruth Davidson resigns, citing 'conflict I have felt over Brexit' – live news Read more

While Davidson has been open about her concerns regarding Boris Johnson’s leadership, on Thursday she backed his decision to prorogue parliament, insisting that she believed he was trying to secure a deal with the EU.

Explaining that her work had always come first over the past eight years, often at the expense of her commitments to loved ones, Davidson said: “The arrival of my son means I now make a different choice.”

Her spokesperson insisted that she been planning her exit before the prime minister announced the suspension of parliament on Wednesday.

Ruth Davidson (@RuthDavidsonMSP) It has been the privilege of my life to serve as @ScotTories leader. This morning I wrote to the Scottish party chairman to tender my resignation. pic.twitter.com/CJ9EjW2RqN

Tributes to Davidson came from across the political spectrum. Scotland’s first minister and SNP leader, Nicola Sturgeon, wished her well for the future, and the leader of the Liberal Democrats, Jo Swinson, commended her “kick-ass approach”. The former prime minister Theresa May tweeted: “Thank you for all you’ve done for our party and our union over the last eight years, and enjoy your well-deserved family time with Jen and Finn.”

Boris Johnson thanked Davidson for her “wonderful service”, describing her as “instrumental in the revival of our electoral fortunes in Scotland” and adding: “She should take immeasurable pride in the pivotal role she played during the Scottish independence referendum campaign, where her passionate support for our Union was crucial to the result.”

Davidson’s close friend David Mundell, whose sacking by Johnson from his role as Scottish secretary against her advice reportedly made her “livid”, tweeted: “I understand and respect Ruth’s decision to stand down for personal reasons. I will miss her greatly. As leader she transformed the Scottish Tories’ fortunes and was a passionate voice for the union. Our politics needs more authentic voices like Ruth’s and I hope that can be her legacy.”

Adam Tomkins, Davidson’s friend and ally, who has been tipped as a possible successor, said: “Ruth has been my boss for the past three years, but first and foremost she is my friend. She was the reason I joined the Tory party and why a lot of people voted Tory. But she is absolutely right to put family first. The toll that political leadership takes on family life is extraordinary.”

Davidson, who was tipped as a future UK Tory leader and prime minister until she ruled it out last year, also said in her resignation statement that her party’s electoral successes had paled in significance compared with the role it had played in the campaign to keep Scotland in the UK during the independence referendum campaign.

The first openly lesbian leader of any party in the UK, she is credited with transforming the party’s fortunes north of the border.

After winning the party leadership in 2011, at the age of 32 and months after first being elected as an MSP, Davidson set about a comprehensive remodelling of the Scottish Tories, subtly changing policy emphasis and bringing in talented individuals who did not fit the traditional Conservative mould.

At the 2016 Scottish parliament elections, the party achieved its best performance in a quarter of a century, pushing Scottish Labour into third place, and in the snap general election a year later, 13 Scottish Tory MPs were elected, a result that was key to keeping Theresa May in Downing Street.

Davidson, a prominent remain campaigner, issued a defiant challenge on the eve of Johnson’s first visit to Scotland as prime minister, saying she would refuse to back a no-deal Brexit.

On Thursday night, Jackson Carlaw was appointed as interim leader of the Scottish Conservatives pending a leadership election, the party confirmed.

The MSP was Davidson’s deputy and acted as interim leader during her maternity leave.