And on newsnight at 10 30. Well go deeper behind the headlines and speak live to key players on todays big stories. Plus, we take a first look at whats on tomorrows front pages. Good evening and welcome to the bbc news at ten, live from the Holyrood Parliament in edinburgh, at the end of a tumultuous day in Scottish Politics. Tonight, the search is under way for a new First Minister and snp leader, after humza yousaf announced he was standing downing afterjust 13 months in office. His politicalfuture had been uncertain since thursday, when he ended the snps power Sharing Agreement with the scottish greens. It left him facing a Confidence Vote he was at risk of losing. Today he said hed underestimated the level of hurt and upset his decision about Power Sharing would cause. 0ur Scotland Editor james cook is with me. Did Humza Yousaf Miscalculate . Short answer is yes and spectacularly so. How so . Because if we wind back, he inherited this Power Sharing deal with the Scottish Green Part