The absolute outrage regarding this when you compare the time Cameron shagged a pig head or whatever it was, or May skipping through the fields of corn, is minimal.
Apples and oranges being compared there.
Neither were pending criminal cases, so the press were free to comment on them without restriction. Both Cameron shagging a pig's head and May skipping through a field of corn both have comedic elements to them, which aided the amount of coverage. They were also both in office at the time, whereas Salmond isn't currently First Minister. The only people that are laughing at Salmond at the moment are people who didn't like him to begin with.