I thought the boyfriend was played brilliantly. My heart just broke when he said "I hope she is cheating on me right now." He was clearly terrified for her.
And when he said something like, he's my phone, search it, search the house, I know how these things work. Etc.it was just so moving. I was clearly not involved on her disappearance.
The mum felt manipulates at the tv press conference but I think maybe the police know how to get the best results. They said for her to sit next to the boyfriend. I cannot imagine how awful that while thing must be but any chance to get a vital clue that could have saved her.
I've read the whole story (Radio Times) no spoilers here please but I do think this programme will be significant. So I'm going to keep watching.