What shouldn't go in your compost bin?

I've been toying with the idea- I've looked on my local council website. They often do "composting deals" I had my worm bin at a bargain price.
At the moment they are doing the Green Johanna Hot Bin for £50. I may join VC?

You're lucky, Scarlet! At that price its worth a gamble.
I don't have to pay for my green bin. Actually, we can have 2 bins, collected fortnightly in summer, monthly in winter. The only stuff I put in there are spiky things, like brambles, hawthorn and holly, tough roots like hogweed, dock and nettle, couch grass and seed heads. All the rest goes to the chickens or the compost bin/Hot bin.