Thanks for that. I'd had a further play last night and made things worse so decided to re-install to save any more messing.

After the re-install I can now see the drive has been partitioned...

I run Win10 64bit on an AS-Rock Q1900-ITX board as a PVR backend and connect to it via VNC as and when required for maintenance. The system runs largely trouble free. Recently I rebooted and noticed...