I'm sorry if these updates are getting tedious, but this is a correction of sorts to an earlier post.
Masterfoods responded today to my original complaint about the newly non-vegetarian nature of Snickers and Mars bars. (Or rather, they replied to a "Mr Purfer_hallard", who they coincidentally seem to believe resides at my address.) Although most of what they had to say I knew already, it does turn out that Bounties and Twixia were never vegetarian in the first place.
While this certainly means that my earlier paranoid speculations were groundless, it also suggests that Masterfoods' decision to be "principled" in announcing their forthcoming departure from vegetarian standards, had not been matched by equally principled decisions in the past.
Oh well, you get the idea. They also reimbursed me for some full-of-meaty-goodness Snickerses I'd returned to them. Of course the cheque's made out to Mr Purfer_hallard.