Hi, This is another update having received some more information from the good folks at Gigabyte Support as the matter is now solved. I was advised to take the following steps:
1 Use Qflash to update the BIOS to FGb
2 Disable CSM and then save this and then boot back into the BIOS
3 Set the Secure Boot Mode to Custom
4 Restore Factory Keys > Yes
This will then take you into Windows and then check System information, you will see that Secure Boot is on. Therefore, the FGb BIOS is fine it is just that with the previous BIOS, FF, I didn't have to do this.
I hope this helps others and thanks again to Gigabyte Support in the UK and Taiwan.
Thanks,
Teknology9