Thanks for replying so quickly.
I re-installed the original AppleHDA.kext into S/L/E using pacifist as per your guide.
I then re-ran your audio_cloverALC-120.command script (auto selected Realtek 887, Audio ID 1) and it did some stuff and now the "Line Out" appears and I have sound on the orange port (same as 10.11).
I can confirm I do now have a RealtekALC.kext in EFI/CLOVER/kexts/10.12 - I also recall having to press <space> at bootloader and select "inject kexts", but this may just be a co-incidence and not needed.
Yippee!!