Yep, I agree Steve !
I spent a long time studying all the photos of 'Black 12', including the 'in situ' crash photos, before committing paint to plastic, and reached the conclusion that there was neither a yellow rudder or, as some sources state, a yellow bottom cowling panel.
If my memory is correct (without digging-out the info), the RAF crash report didn't mention any yellow-painted areas either, as you also stated regarding the CEAR.
I'm guessing that, somewhere along the line, some authors/profile artists, made an incorrect photo analysis !