On this page you can download some useful material from America about Transition.
Although it is from the USA, much of it is relevant to the UK, as the post-16 transition process works in much the same way. The checklists are particularly useful and could be used to inform year 8, 9 and 10 annual reviews. You may also find it helps you to focus on the new way of looking at your child approaching transition.
Understanding my strengths and needs
The Bridge to Adult Living