Er, depends on what you’ve asked for doesn’t it?
Wrapped (to take home – which, by the way, makes your car really stink for weeks) – here the S&V should be put on by the spotty, greasy haired oik serving you.
Open (to scoff in the street, so looking like you’re either unemployed, from Stevenage, or both) – here the S&V should be applied by yourself.
It is always salt first, vinegar second whichever of the above scenario is being played out.
Vinegar must also be put onto mushy peas.
End of discussion.