In British English, both the hyphenated and non-hyphenated forms are used. The same goes for the verb "cooperate/co-operate".
Please note my changes above. Remember to include an actual question in your post. When you use an ellipsis, remember to put a space before (and after) the three dots. Also, whenever you give us more than one option or sentence to look at, please number them. It can make it easier to refer to the options in our responses.
The point of co-operation is to make sure the reader understands the punctuation. Nevertheless, the word is more likely to be used without it (the hyphen).