
I was highly amused to notice last week that one of the major ingredients of Percy Pig(s), along with glucose syrup and sugar, is pork gelatine. Pork – pig – Percy Pig. Get it?
However, according to Wikipedia, pig-shaped sweets are "a traditional sweet in the United Kingdom and have been around for many years".
I don't recall there being many pig-shaped sweets in my youth, and if there were, I don't know whether they contained pork gelatine. But I imagine they probably did, so I can't give M&S staff too much credit for their wit.