I'm a couple of months behind with this one, but better late than never... In October the NSPCC published An Introduction to Child Protection Legislation in the UK. This is a 13 page guide to all of the major parliamentary Acts covering child protection, providing brief, simple overviews of each one, and also helping to put them into context with supplementary information. As an introduction to this complicated subject, it should be very useful.
To read the guide in full, click here.