Hmmm, I reflashed the SD card with Etcher, so now I can view, and write to, the contents of STORAGE partition. It only holds a lost+found folder and a file called .please.resize.me. at that stage. To get the STORAGE partition correctly set up I booted from the card and waited five minutes. To copy advancedsettings.xml to .kodi/userdata I opened the directory in root mode (right click-open as root), then I could paste the file. After another restart I found the kodi.log file in .kodi/temp. Log file posted as per instructions. Link:
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Thanks again.