My latest academic article may be of interest for those concerned with civil liberties and the right of peaceful protest. http://www.pbs.plymouth.ac.uk/solon/hjournal2013Vol3.html
K. Reid 'Letting Down the Drawbridge: Restoration of the Right to Protest At Parliament'. (2013) 1 Law Crime and History 16 (pp. 16-51) (Internet (free access)). ISSN 2045-9238.
It is about the law and history on protest around Parliament, including the ban that was enforced under SOCPA 2005 and the new narrower restrictions. It is lengthy, but the general reader can look at the headings to easily spot key themes and glance at the parts they are interested in.