Those helpful people at the Welsh (Cymru) National Grid for Learning produce a range of free sociology and psychology resources to support the WJEC / Eduqas exam board Specification.
For Sociology, you might find these two Sociology texts created for the new 2015 Specification particularly useful:
Psychologists might also find it’s worth downloading the PY3 and PY4 eBooks.
These resources are available in both text and flash versions.