Scotland’s First Minister Nicola Sturgeon will join the EU referendum campaign fray on Monday, appearing alongside Plaid Cymru’s leader Leanne Wood, and the Green Party MP Caroline Lucas to set out “the progressive case” for voting to Remain.

With the Labour In For Britain campaign so far eclipsed by the clash between the Government and the Conservative-led Vote Leave group, Ms Sturgeon will seek to shift attention onto the social benefits of EU membership, including maternity rights.

The campaign event in London will see Ms Sturgeon reunited with fellow nationalist party leader Ms Wood, with whom she has enjoyed positive relations in the past.

Alongside, Ms Lucas, the leaders are expected to make a bid to change the debate on EU migration, hailing the benefits of freedom of movement.

Speaking at the SNP’s National Council meeting in Perth on Saturday, Ms Sturgeon said she was a “passionate” believer in the “positive, progressive case for EU membership”.

“The social protections and benefits that membership has given us – from maternity rights, to workers’ rights to freedom of movement - are almost so ingrained in our daily lives that it is easy to take them for granted,” she said.

“With the Tories itching to scrap the Human Rights Act and their attempts to curb Trade Union rights, it is clear that these social protections would not be safe in the hands of a Westminster government.”

What has the EU ever done for us? Show all 7 1 /7 What has the EU ever done for us? What has the EU ever done for us? 1. It gives you freedom to live, work and retire anywhere in Europe As a member of the EU, UK citizens benefit from freedom of movement across the continent. Considered one of the so-called four pillars of the European Union, this freedom allows all EU citizens to live, work and travel in other member states. What has the EU ever done for us? 2. It sustains millions of jobs A report by the Centre for Economics and Business Research, released in October 2015, suggested 3.1 million British jobs were linked to the UK’s exports to the EU. What has the EU ever done for us? 3. Your holiday is much easier - and safer Freedom to travel is one of the most exercised benefits of EU membership, with Britons having made 31 million visits to the EU in 2014 alone. But a lot of the benefits of being an EU citizen are either taken for granted or go unnoticed. What has the EU ever done for us? 4. It means you're less likely to get ripped off Consumer protection is a key benefit of the EU’s single market, and ensures members of the British public receive equal consumer rights when shopping anywhere in Europe. What has the EU ever done for us? 5. It offers greater protection from terrorists, paedophiles, people traffickers and cyber-crime Another example of a lesser-known advantage of EU membership is the benefit of cross-country coordination and cooperation in the fight against crime. What has the EU ever done for us? 6. Our businesses depend on it According to 71% of all members of the Confederation of British Influence (CBI), and 67 per cent of small and medium-sized enterprises (SMEs), the EU has had an overall positive impact on their business. What has the EU ever done for us? 7. We have greater influence Robin Niblett, Director of think-tank Chatham House, stated in a report published last year: “For a mid-sized country like the UK, which will never again be economically dominant either globally or regionally, and whose diplomatic and military resources are declining in relative terms, being a major player in a strong regional institution can offer a critical lever for international influence.

The SNP leader will also meet with the new Labour mayor of London Sadiq Khan on Monday, in a head-to-head where the two leaders will discuss economic links between London and Scotland, and their shared opposition to a range of Tory policies, SNP sources said.

Senior Labour figures have in recent days raised the prospects that any future Labour government may have to work with the SNP. With recent Scottish election results seeing the party slip into third place, seemingly eradicating any hopes of a Labour resurgence in Scotland in the 2020 General Election, hopes of a Labour majority at Westminster are thin, and a number of Labour figures see some accommodation with the Scottish Nationalists as the only likely route to power.

Yesterday former Prime Minister Gordon Brown returned to the EU campaign trail, issuing a plea Britain’s nine million Labour voters and young people to turn out and vote on June 23. Polls have shown that Leave supporters are more likely to be older, and more likely to turnout to vote – a factor that gives the Leave campaign the edge in some polls.

Speaking at the Fabian Society, Mr Brown also urged mothers to vote to stay in the EU for the sake of their children.

“If we the British then decided we were going to walk away from our nearest neighbours, refuse to cooperate on economic and other matters that are vital to our future, deny young people in our country the chance to plan for the future because we are breaking off links to countries that are nearest to us, what sort of message would we send to the world about what kind of world we are going to build for the future if we could not engage in cooperation with our nearest neighbours?” he said.