I still can't access the home folder from Final Cut Pro or iMovie. I've been using the second account I made for the time being to do my editing on.
On my Oli account, I searched 'Oli' in the spotlight search, then clicked 'Show All in Finder'.
Then in the finder that popped up, under the header of 'Folders', it only showed the new user I had made, 'Oliver'.
On the Finder, I then selected my mac under Devices, and in the User folder, it only had 'Oliver' (the new user account) and 'Shared'.
I think I will just have to setup the new user and delete the 'Oli' one.
Thank you so much for your help. I appreciate it.
Cheers, Oli