it's probably both tbh
Toffee Crisps DEFINATELY had a recipe change.
( theoriginalsteve <this space intentionally left blank>, Mon 18 May 2009, 17:07, archived)

Sometimes things boast "New, improved recipe!"
in big letters on the packet for a while.

In reality, improved cheaper.

This happened to Yorkies, and some popular brand of Prawn Cocktail Flavour crisps.
( Moon Girl Technologies horrendous beanbag, Mon 18 May 2009, 17:19, archived)