Thanks, Lauren for the welcome.
In the U.S., it's called either the "Special Edition" or the "860" (instead of "86"). It's available in the orange that I have or what Toyota USA calls "Halo", which is either white or off-white. It almost looks as if this was originally a "halo" car that was re-sprayed orange. You can actually see the paint spray pattern fade from one color to the other under the bonnet.
I haven't lifted the carpet in the boot yet, but I did stick my head in and look up inside underneath the rear window. It is painted orange, but the paint is very thin, so that areas of white show through.