I would guess it will be something like;
BBC Studios -
Good Food (not the name)
Really is the only one I am not sure about. My guess is discovery might have it.
I'm guessing Really will go to the BBC given that it's more of an entertainment channel, and it's going to be a 60/40 split (which is why the BBC are paying Discovering £100m for a 10% stake).
By UKTV Productions, I'm assuming you mean UKTV Originals (UKTV don't make their own programmes)? I would have assumed that individual programmes/series will go to the channel they were commissioned for.
Not so sure about UKTV Play. Can't see it surviving in its current form with the 6 'BBC' channels. I'm guessing that could get broken up like the rest of UKTV, with some channels becoming part of BBC iPlayer (with some channels only available to subscribers), and the rest becoming part of Discovery on demand.