A lot of history teachers very generously share some of their ideas and resources via Twitter, Blogs, Facebook etc. Even pay sites (such as Active History, History Resource Cupboard, Key Stage History) often have a lot of free content. I have also put links to some articles in Teaching History editions which have come out after the book has gone to print, on the assumption that your training institution will have subscribed to the journal or that you will have taken out a personal subscription. As noted in the book, reading and using Teaching History is a very important part of getting better as a history teacher.
There may also be some links to some newspaper articles, new edicts from the DES or missives from Ofsted, and articles about education and learning more generally. I have tried wherever possible not to use things that are behind a paywall, aware that this can be frustrating, apologies if I have sometimes made a mistake on this, or if circumstances change. (As I write this, articles in The Guardian are open access, but things change.