Hi richr - thanks for the reply and I think you're right about me looking at the incorrect engine!
I was looking at the Driver's Manual and in the fluids, it said that I needed CVTF-J4 for the Front Motor and then underneath, it said I needed ATF-SP3 for the Front and Rear Transfer cases.
When I looked online and for 'How To' videos, I saw the video for the Transfer Cases, but the exhaust layout was slightly different to what was underneath my car, but I could still see the Drain and Fill Plugs, however other videos that spoke about replacing the CVT Fluid, they all said that it should be re-filled through the Filler Tube with the dipstick (it had a white top).
However, when I looked at my engine, there was no filler tube and it had the EV Motor there.
I just went and ordered both CVTF-J4 and ATF-SP3 fluids because that what was in the Driver's Manual!
On reflection, I think I may have been premature and the Manual obviously covers different engines, so it will be for both PHEV's and Diesel engines.
Your confirmation that I don't have a gearbox [resumably means that I don't need the CVT Fluid then?