Jimmy examines how plastic packaging is polluting the food chain with potentially global implications. Is it really possible to predict if you'll love or hate Marmite? Matt runs across a custard pond.

How much orange is in orange squash? Why's maple syrup so expensive? And what's with all those little holes on biscuits?

Jimmy learns about the battle against the hidden nuisance that leads to corked wine. Plus: the surprising difference between runny and set honey. And okra.

What gives some whisky its smoky flavour? Why doesn't halloumi melt? And how do you get corn off the cob?