BOAC, I created a large post earlier today about the MEL you posted. When I went to post, it said it needed to be reviewed by the moderators. Hopefully it will be posted.
I was posting the NG MEL for autothrottle and it didn't match up with what you posted. Was your posting for the NG from your company MEL?
Still digging into the right rad alt logic for the autothrottle computer; it's definitely wired up to it!