Ok, I’m probably wrong here but in the interest of speculation hear me out – I’ve been looking over the set reports from episodes 1 and 5 and two lines have really jumped out at me:
“There were three guest actors in the studio: one man, one woman and A FEMALE VOIVE OVER” (episode 1) and “The show’s only guest star appeared as a VOICE OVER” (episode 5).
I’m wondering at this point if Hattie is making a return as Holly? We already know she/he was drowned out before BTE and isn’t a regular character in series X. But that doesn’t mean she/he can’t return as a guest. It’s reasonable to assume the damage was so extensive she can only be revived for short periods of time and without appearing on screen.
I for one would welcome her return, she’s always seemed more positive about the series than Norman Lovett and if the character was to return it would be far better with her. Anyway, I haven’t been to any of the recordings and am looking forward to the new series, it really seems we’re going back to the feel of the III-V era, and that can’t be a bad thing!