There are lots of useful links and resources available. Rather than duplicate then all, as we come across them, we will put them on this page for people to look at at their leisure. Whilst we have no control or responsibility for their content, they are nonetheless interesting and useful. If people come across other links or resources, please let us know and we'll bet them posted up here for all to share.
Here are a few to start us off (click on the link to open):