Yes there was a picture of her being gagged.
I'm wondering whether the lack of accent is a clue, which is why I was wondering about it. So we're taking it for granted that the captors were English? (I am, now, because I'm convinced butcher is innocent).
See, I thought it was Sophie who had returned in place of the real Alice, that it was Sophie in the shed, and that is the real Alice who's now free. Hence the accent thing. Sophie is French, and even if held captive by English people, to my mind (obviously no expert, me) she'd have traces of a French accent still, and would be able to speak French.
The girls are similar looking; perhaps enough to convince police that they're one and the same. But Gemma wasn't convinced, as Alice's mother. And she was dna'd against Sam but not Gemma. He's her father, but there's no evidence that Gemma is the mother.