Check out BBC Bitesize: http://www.bbc.co.uk/education/subjects/z34k7ty
Zak (O Level) : http://zakonweb.com/
Python Bytesize: http://www.pythonbytesize.com/
Viet Jack: http://vietjack.com/python/index.jsp
Coding game (problem solving and programming practice): https://www.codingame.com/servlet/urlinvite?u=2538640
http://www.cambridgegcsecomputing.org/ (requires free account)
Here is a link to the whole set of GCSE POD videos to download onto your device and watch to help you recap topics and revise.
Here's a downloadable set of animations to explain some of the concepts in the textbook.
Craigndave on YouTube
https://www.youtube.com/channel/UC0HzEBLlJxlrwBAHJ5S9JQg/playlists?sort=dd&view=50&shelf_id=9