This artcle (linked earlier:
http://www.thesun.co.uk/sol/homepag...been-stashed-for-a-week-in-her-own-house.html) is particularly interesting to me, as are the questions about who would murder someone that was a random target and then move the body.
If the idea is that she was murdered, fully dressed with no sexual assault and then moved to a different location, I would say it was the boyfriend. That seems like a staging to make it look as though she was murdered somewhere other than her home ... to take the investigation away from home.
If the body was stored in the shed and then moved to the other location ... maybe during those 4 hours between the boyfriend returning to the flat and raising the alarm ... then it points to the boyfriend. The circumstances seem to point to the boyfriend, but I'm guessing that there is an alibi through the brother and his family. If it wasn't the boyfriend, it has to be someone else that had reason to want investigators to look at the wrong location ... meaning ... to me ... that the murderer is very close to home.