The SNP is facing a disastrous general election result

Any uncertainty about the extent of the damage inflicted on the SNP by the criminal investigation into party finances can be safely disregarded. An extensive poll by YouGov suggests that those scenes of a police forensics tent outside Nicola  Sturgeon’s Glasgow home, and the arrest of her husband, the SNP chief executive, Peter Murrell, have done lasting damage in the SNP heartland.