Thanks. I've run it, and I'm getting 6 items for review: 3 are programmes which just need updating, 1 is to warn that the sidebar gadgets aren't on W8 (I knew that).
The other two items are a little more concerning:
Install an app to play DVDs - You may need to install an app to play DVDs in Windows 8
Secure Boot isn't compatible with your PC - Your PC's firmware doesn't support Secure Boot so you won't be able to use it in Windows 8.
Anything to be worried about?