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The Windows 11 in-place upgrade appeared to install perfectly happily, but on first reboot the machine produced a BSoD with the issue being INACCESSIBLE_BOOT_DEVICE. The machine then failed to automatically reboot, and after a manual power cycle it realised there was an issue and rolled back to Windows 10 🙁
The issue was due to a specific driver that was on the disk controller (this was despite - or perhaps because of! - having applied all available Windows and system updates prior to attempting the OS upgrade). The resolution was to go into Device Manager, expand the IDE ATA/ATAPI controllers and 'update' the driver for the listed controller (was shown as an Intel controller) to use the standard Windows driver:
Right-click the installed device
Select 'Update Driver'
Select 'Browse my computer for drivers'
Select 'Let me pick from a list...'
Select 'Standard SATA AHCI Controller'
Click Next and complete the process (reboot if necessary).
Re-run the Windows 11 installation and all should now be well during the setup reboot process (and it may even update the controller driver back to the Intel variant).
