OK, here's something completely different, a weird and perverse idea which I don't believe myself and which is just waiting to be shot down in flames:
Jo’s relationship with Greg is on the rocks and she’s unhappy about it. He’s gone off, leaving her sad and lonely and “at a loose end” in the strongest sense of the expression. She hangs around at the party and drinks too much. She dawdles around shops, without buying much. She can’t handle being alone – no experience of it. She has a bright idea that makes her smile: she texts a guy she hardly knows to invite him…but heart sinks further when, predictably, nothing comes of it. She arrives safely home, takes off her boots, puts the pizza in the oven, swigs some cider while it’s cooking and bursts into tears. When her sobs abate, she finds she has burnt the pizza. It’s the last straw. She decides to end it all. She scribbles a bitter suicide note on the pizza packet and props it in a prominent place, then hangs herself using a belt or a cord. That is the scenario Greg discovers on his return after his weekend away. He is appalled at the event but also at how he will look, especially if the suicide note is especially hostile to him… So he decides to prevent the truth from coming out.
At that time of night, he can safely convey the body to his car using a holdall he had used for his excursion. He is streetwise enough to leave his mobile in the flat while he transports the body to a place of temporary concealment not too far away – the rifle range ? He discards the suicide note, the hanging cord/belt and the burnt pizza at a safe distance and returns home to clean up and create the impression of the flat he wants to leave and finalise the story he is going to give the police. All this takes four hours… The perfect touch would have been to leave a worried message on Joanna’s mobile, but he doesn’t think of that. On Christmas night he takes the body by a roundabout route (not crossing the suspension bridge) to the place it is destined to be discovered a few hours later.
Anyone still reading ? Would you like me to resign from this serious and intelligent thread immediately ?