Thanks again for the replies.
I played the AtariST version yesterday. Whilst watching the cricket. So I've played all 3 now.
Interesting seeing the little differences in the colours on each platform. No speech though.
I feel convinced there is no talkie. Like I've said the only way to get a certain answer would be to ask somebody from Delphine. But after putting in a lot of time with this, and my search skills aren't lacking, I feel as though I've gone as far as I can.