Chosen Solution
So in essence, the front facing camera works, perfectly. Unless the shield plate is screwed on.
This is not my photo, it is taken from google images to point out the shield plate in question This is the shield plate I am referring too, with the camera flex underneath. I can’t find any information on this, my best guess is the flex ribbon is being pinched by the shield and stopping it from working, so perhaps I am putting the shield plate on wrong? ( albeit not very easy to put it back on at all ) I’ve tried using the phone without the shield plate, but of course the interference the plate blocks was missing up the digitizer just a bit too much. Any help would be great, thanks :)
From what I can see in your picture it seems your front camera cable gets under the shield improperly. Maybe it’s just a wrong impression I’m getting from the picture lighting, but check that everything is positioned correctly, maybe consulting iPhone 5 Screen Replacement as a guide. The shield is there to protect and keep firmly in place the flat cables connectors, not to avoid interferences, thus it’s quite likely the digitizer connector isn’t sitting properly in place. It should lock with a light click on its connector, without forcing it in, and should work properly even without the shield.
I’ve decided to use the phone without the shield on the LCD connectors for now. Thanks to Arbaman for helping me out with this. Will update if a more permanent solution is found :)