Jeremy's WS said he received Neville's call at 3.10am. He phoned the police at 3.26am. Or even 3.36am.
However during the 16/26 minutes between Neville's call and the police call, he did not phone Julie. Who said so ? Jeremy.
'Christ you took you're time', he said to the policeman on the phone. Suggesting he was on the phone for several minutes when calling at 3.26am/3.36am.
So he would not have time to phone Julie after his call to the police, get dressed, leave his cottage and arrive at WHF by 3.48am. Anyway Julie and none of her flatmates said the call was after 3.30am.
So the only possible time Julie could have been called, was before 3.10am. Which corresponds with some of the flat mates evidence.