This case will never be solved too many arguments about what actually happened too many contradictions too many clues and nobody can agree about what happened.
The manager, the senior manager and the partner all said there was one set of keys so for me 90% of what people think must have happened cannot have happened.
If there was one set of keys and the police used them to get into 37 Shorrolds road SL never had them so could not have gone there to meet a client nobody can place her car there at any time.
Conclusion she never went to Shorrolds road
If we go on your theory nobody can place Suzy anywhere after she left the office but she went
Somewhere the question is where.