The seriously funky Nick Lear sent me a picture as he said it combines my diverse fetishes! Made me laugh although I should point out that I regard Marmalade as apocryphal to the jam world and not cannonised in any way! Real Jam does not contain Peel!
If you've just found this blog via Google and wonder what this has to do with youthwork? the answer is nothing and you need to scroll down!
http://www.straightdope.com/classics/a951124a.html
Thought this link might help in determining the difference between jelly, jam and marmalade.