This raises a question for me. Let's assume Libby's flatmates left Welly at 3am and got a taxi home/walked home etc. When they got home obviously Libby wasn't there. Did they not think this was unusual?? I'm assuming they checked if she was back and they already knew she didn't have her phone on her that night- meaning she never text them to say she was back safe. Would this not prompt them to immediately check her room when they got home? Or if her door was locked, did they at least knock? Maybe they thought she was asleep. But if I was one of her flatmates and she never text me to say she'd got back safe, I'd be banging on her door to make sure she was in there, and then if she wasn't, I'd immediately call the police or even go looking for her myself. But maybe that's just me. Just seems odd to me that no one realised she was gone until the morning.