Probably a third party co-manufacturer for seasonal chocolates.

Matey with the pic of the wrapper wants to be careful he doesn't lose his job!...I dare say that if his boss or someone appropriate at his compay knew he was stealing property of Mars and sharing it on a website like this they wouldn't be happy!...Third party co-manufacturers probably rely on their ability to maintain their credibility and ensure stuff like this doesn't  happen in order to secure lucrative contracts from the likes of Cadbury, Mars, Nestle etc...they wouldn't give firing him a second thought if this dude put their business reputation on the line!