Ah, Sorted now. I managed to clone another hard drive. This doesn't work right off you still need to apply an update via a pend rive. But once this is done, the hard drive does pick up and work.
I've managed to open my Xbox one, tested the hard drive and it has failed (error scanned and it's 90% bad sectors). I've got a new harddrive for it, but can't find where to get the correct software for it/ how it needs to be formatted. You mention this info at the start of this repair but cant see a link to the software.
If there are no links, would cloning another xbox one harddrive work as a repair?