Researching the Extreme Porn Laws
CPS Guidance: “how the CPS think the law works”. http://www.cps.gov.uk/legal/d_to_g/extreme_pornography/
Repeal Campaign on YourFreedom. http://yourfreedom.hmg.gov.uk/repealing-unnecessary-laws/repeal-section-63-criminal-justice-act
Initial view is that this is an unworkable law that threatens to ruin lives on a subjective and inconsistent value judgment based on an illogical distinction. Probably also flawed logic underlying as well.
Further reference will be to look on academic work: Susan Sontag has a useful essay, and will try to dig into the story more.
Perhaps also find and interview people affected by and/or supporting the law?