I'm getting somewhere now, the application log showed me things starting at 1:01am for two days in a row, so I just set it to 1am and hey presto, it booted up.

I then reset it to 1am and left it in Windows to find that the Windows Media Program Guide started to download at that time (odd as it is set to download whenever connected to the net!) I set it to manual download only and did some more testing and it looks like it has done the job!