Fears of an SNP takeover are coming to life; yesterday one of their top people, Stewart Hosie, laid it on the line that they would block defence spending if Mr Milliband refused to scrap Trident. This could lead to unpaid salaries and delays in equipment projects. In the normal run of parliamentary process this doesn't happen even when parties have major differences. But in the SNP case they would prefer the UK didn't exist so the more mayhem the better