problems with wp_list_categories()

This is driving me nuts; I’m using wp_list_categories() in a sidebar.php. With no arguments it lists all the categories I’d expect but as soon as I add any kind of argument it shows ‘no categories’.

In the code below I include category ID 3, double checking the category exists with an echo of it’s description. The description appears but the list is empty. I know I’m missing something blindingly obvios, any thoughts would be appreciated.

wp_list_categories(‘include=3&hide_empty=0’);
echo category_description(3);