Scottish independence: Scottish Green Party launches 'Yes' campaign 15 November 2013 Last updated at 00:20 The Scottish Green Party is to launch its campaign for a "Yes" vote in next year's independence referendum. Key figures from the party will set out why they believe Scotland would have a better future outside of the UK. Co-convener Patrick Harvie and fellow Scottish Green MSP Alison Johnstone will join singer Karine Polwart at the event in Edinburgh. They will set out why they believe it is unlikely a Westminster government will address Scotland's needs. They are also expected to outline the track record of devolution, under which they will say Scottish politicians have kept the NHS in public hands and maintained free education. The Scottish Greens will give their views on the Scottish government's forthcoming White Paper on independence, the transition of power in the event of a "Yes" vote and how the party believes this power could be used to create a better Scotland, as well as the time-scale for writing a constitution for an independent country. A party spokesman said: "The independence debate is a chance to ask what kind of society we want, what kind of economy we want. Many voters remain undecided and by launching our own campaign, Scottish Greens can reach out to those key voters. We look forward to making the case that a better Scotland is possible, and that a 'Yes' vote is the best way of getting there. Voters in Scotland will be asked the straight yes/no question: "Should Scotland be an independent country?" when the referendum is held on 18 September 2014.