Yesterday (Monday 29th April 2013) the Open Rights Group published a report called “Digital Surveillance Why the Snoopers’ Charter is the wrong approach: A call for targeted and accountable investigatory powers”
The report is written with general audiences in mind and gives the history of surveillance policy, looks at the current state of the law and why surveillance technology poses problems for civil liberties.
It also shows how the issues that the Communications Data Bill (aka the "Snoopers’ Charter") is intended to deal with, can actually be addressed by options that are much more targeted and which do not pose a threat to civil society, unlike the powers provided for in the bill.
It makes interesting reading.
It is available to read or download at: http://www.openrightsgroup.org/ourwork/reports/digital-surveillance/
There is also a video introduction to the report by some of the authors available at: http://www.openrightsgroup.org/blog/2013/digital-surveillance-video