"...freedom of expression should not be measured by how likely the average person is to be silenced, but by how likely someone with something to say is."
Here is a link to ss132 - 138 Serious Organised Crime and Police Act 2005 which was designed specifically to stop the chap above demonstrating.
Pathetic isn't it?
Well, here's what happened when the law was applied, Haw, R (on the application of) v Secretary of State for the Home Department & Anor  EWHC 2061.
Case C-274/99 P, Bernard Connolly v Commission of the European Communities. I know it sounds childish but I think it was the book cover that did it for him.