I think that is why they did not want to use C.S's car to take Tia's body from the house, any movement would be traced.
I wonder if SH had planned to steal a car or had some other plan which went wrong.
I would not think he had planned for Tia to remain in the loft for as long as she did.
I do think that Tia's murder (if it was indeed murder, not an accident which I think is still a possibility) wasn't pre-meditated: IMO too many details changed and the stories of SH (if he was involved) weren't well thought out enough to have been a pre-mediated plan. Therefore I believe that for whatever reason TS was murdered (unless it was death by accident) it was a reaction to something that happened on that day (an argument, trying to silence her etc.).
Therefore one thing I do feel is that the story of Tia going off shopping in Croydon was intended to send the search away from the house, away from the immediate area, and away from the family themselves. Whoever is responsible probably didn't think the CCTV would be such an issue (maybe either not considering it, or thinking it would be plausible for someone not to be captured on CCTV during the journey she took somehow)- not realising the police would search so closely to home and there would be no chance to move the body later.
I don't think moving the body would be an immediate thought after TS died/was killed- probably the main concern would be to hide her, and tidy/clean up to hide/destroy any immediate evidence as moving her would be too risky or perhaps they were in shock over what had happened (as I said I don't think it was premediated). Once the police decended, there was nothing to do but sit and wait, try not to raise suspicion and hope they got away with it. When the loft was searched SH (if it was him) must have thought he'd gotten away with it, so then it was a case of waiting it out until things died down. Maybe the elaborate funfair story, and the cleaning details were brought on by increasing police suspicions that Tia never left the area and it was the pressure that brought the stories out. SH thought he was covering all bases by elaborating the story, but it just made him look more guilty. Based on the idea it wasn't pre-mediated, it would explain why a lot doesn't make sense- whoever did it was not thinking straight, then tried to backtrack later. Maybe rushing out and searching a funfair seemed plausable at the time, when a rational person would start closer to home and ask neighbours/phone the missing girl's mother before searching random places further afield (after seraching/asking around the immediate vecinity and informing NS, I for one would have started by taking the route Tia would supposedly have taken to the shopping centre, then asked around the shopping centre itself as that's where he said she was heading, before searching funfairs at random!). The point is- I don't think whoever did this was thinking rationally, so trying to rationalise it is probably impossible! :banghead: