This video helped me out a lot. Unfortunately, the option is still present, but all data has been removed from the C : drive. Maybe clearing CMOS would remove it, when I select the C : drive Ubuntu install the screen flashes and returns to the BIOS so there's nothing to run.
I used this method of using Minitool Parition, changing the Boot data partition to an accessible drive letter (The video used "Z:", I was worried this would upset Windows but it's fine, just be sure to return it to "None" before you reboot). Then I used PowerShell to access it, and followed the above video, accessed...
Remember to return the boot partition from "Z:" back to "None", again I used Minitool Partition Wizard.
Then, in the process of installing Ubuntu I removed the C : drive, installed Ubuntu and I guess when I plugged it in again, the BIOS searched for boot data and it didn't find that failed Ubuntu install so SUCCESS.