I can back Maggie up with the fact that Jeremy was advised/led by the police to phone Julie. That was when he told her that a police car would pick her up from the station on her journey into Essex.
Remember that Jeremy had no family left,to speak of. Obviously,if there'd been a closeness with the relatives,he'd have been in touch with them as they were nearer than Julie,,but because there wasn't,he didn't have a choice,and his pal Brett was in Greece at that time.
If I had relatives like that,I'd only speak to them through a medium !
Look for the sources yourself.We all had to do,for reference.