Peter Murrell, 58, is being questioned after being taken into police custody on Wednesday morning. I still wonder if it may have influenced the timing of her departure because her husband's arrest would be much more awkward for her if she was still in office as SNP leader and first minister. "Scottish Conservative leader Douglas Ross said: "This is clearly a very serious case and it's absolutely crucial now that those at the top of the SNP, including Humza Yousaf and Nicola Sturgeon, co-operate fully with this ongoing police investigation