I don't think we'll ever know Jane. Maybe Len Foakes or Barbara Wilson would have telephoned the Police in the morning upon discovery of the non-activity. Jeremy would have been told at some stage and come out with the same story, unless I'm missing something here.
Steve, perhaps I should have been more clear. What I meant was, had Jeremy done nothing more than contact police about the alleged call from Nevill, the soc police would have been left to their own devices without Jeremy's input/interference, and I believe, would have carried out the task more efficiently. I has, however, been pointed out to me that he needed to turn up after police because he needed them to see him arrive, thus providing him with an alibi. Nonetheless, I believe he deliberately hindered them.