I have been going round in circles for hours trying to fix this one and I can't. It is just driving me mad.

My normal style has 18pt line spacing after it. What I want to do is when a user hits the bullet point list on the toolbar, I want that list to have 0pt line spacing after it as default. I do not want them to have to apply a style to list or anything. I just want it to work straight out the box. However I cannot work out how to do this.

PLEASE, can anyone help?!