Sorry, fast boot is off - has been since I had an odd bug with restarting.
The USB was made via their media creator tool.

I assigned a letter to and chkdsked the FAT32 partition of the drive. It...

Just tried without secure boot. Same issue.

Hi Ken.

Just amended the first post with the attached file. I had disabled the antivirus though I think the PC is still set to secure boot. It's a Sony VAIO with the odd BIOS so I'll give that a...

Just made a USB to upgrade the PC to Windows 10.
Gets to the end of the process but before it restarts a little window pops up to say Windows 10 installation has failed!
Attached the setuperr.log...