@bottleofbeer I agree with you on the general point, but didn't the documentary say SJ drove round part of the route twice before arriving at the shop, as well as not having any means to pay once he got there?
But then, we've all had days like that. The number of times I've driven into town & walked into the bank ready to pay a bill, only to realise I've left it at home, is nobody's business. And I don't have arguing teenage daughters to organise.
Having seen the documentary & listened to the podcast someone upthread recommended, it seems impossible to say one way or the other. What I was left wanting more information about was (a) how big the garden was & how visible the tent pegs were from different places, (b) the black plastic bag on the patio & whatever was inside it, (c) how ANYBODY is supposed to have done it & left without visible blood on them, including the plastic-man, the alleged stalker & the mystery man in the overcoat.
Also, what was SJ's car & where did the girls sit? TV showed an MGB roadster & talked about putting the top up; podcast said it was a Rover MG coupe.