Thank you all for the clear responses, and aid, to matters I generalise about! First, the matter of creating in one program and ‘editing’ in another – which Kelleytoons also neatly elaborates on. As newbie I don’t see the obvious, and really important,tutorial or advice about planning your project from the very outset. Kelleytoons would agree with me that the character leaves (should leave) CC –the dressing room, if you will, ready for action – iClone being the studio. On that thought maybe Reallusion should consider a name change; ‘Dressing Room’and ‘The Set’ , or at least refer to them in similar terms in tutorials as there seems to be a bit of confusion!
   Therefore, avatar setting up is done to the same lighting (background photo) etc as the intended‘shoot’. I have been building a character in CC with the default outside lightsand, I presume, the default reflection in the eye of an interior (!).  This character will be both inside and outside, but, following Kelleytoons advice, I will make two, rather than edit eyes in iClone. I take it I can alter the eyes’ reflection in iClone! As it is, the avatar is not leaving the dressing room 100% ready and does need a bit of fluffing up once on the iClone set. Newbies, such as I, be warned!
   It would be interesting to see if Reallusion starts to reduce the character building aspects in iClone and focuses its role more on the actual set building and ‘movie’ making. In other words; the avatars, and clothes etc from a future iClone 8 would automatically appear in a future CC3. 
   As for my disappearing wardrobe: had to reinstall it, and others, as it must have gone missing when I upgraded to iClone 7. A worrying reminder that all is not perfect in file building in Reallusion!I thank you all for your time and as I am working on my first project, no doubt you will hear more from me as I flounder my way along…

Speaking of eyes specifically, the eyes in iClone are better than those in CC (and for that reason I have moved them over to CC, as I do with most "character" things).  And they are PBR which do not need special reflections.

Somewhere someone (Animagic?  This old brain doesn't remember exactly) talks about having to alter, slightly, those iClone eyes to get a perfect surface (get the reflections just right -- again, they are PBR and so "reflect" whatever is in your IBL).  I'll see if I can find and link to it here.

Sigh -- can't find it, but perhaps if Ani (or whoever wrote that) is listening they will chime in.  Anyway, the eyes in iClone have PBR correctly applied, with AO and such, and are so much better than the CC ones.  I'd recommend using them.

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Alienware Aurora R16, Win 11, i9-149000KF, 3.20GHz CPU, 64GB RAM, RTX 4090 (24GB), Samsung 870 Pro 8TB, Gen3 MVNe M-2 SSD, 4TBx2, 39" Alienware Widescreen Monitor
Mike "ex-genius" Kelley

Kelleytoons: Many thanks for that info on the eyes - and also the knowledge that the two progs are not balanced! The learning curve is not that steep if you just want to move a talking avatar around an office but when you want to light them, make them old and wrinkly with sweat, then life gets a lot harder and my poor laptop strains at the effort. Don't worry - I have read up on reducing the CPU workload - just not looking forward to render time!