I just got two packs of Cheese and Onion Smiths' crisps in my 6 pack of Walkers salt and vinegar. It seems even they are confused about which colour is which! :
Smith's cheese and onion and original chips recalled over plastic piece contamination fears - ABC News
Golden Wonder Cheese & Onion Crisps 6X25g - Tesco Groceries
What explains the collective British memory of salt and vinegar, and cheese and onion crisps swapping packet colours in the 1980's? Apparently this never happened but I think I remember it. -