OK last question, I'm accessing the /Storage/ by plugging the USB stick into a linux box. /LIBREELEC and /STORAGE show up.
I can read and write to /LIBREELEC but only read /STORAGE (I get a permission error message when trying to paste files into /STORAGE or any of it's sub folders..).
I think I may have to go down a windows install route and do it that way purely from a time frame point of view. I'll keep playing though!
Matt