They obviously discussed what Julie would say in her 8/8/85 WS.
Bamber would prefer he called Julie after the police as he said he 'immediately called the police'.
Obviously he advised Julie to say 'around 3 30am'.
The point of reference is when she is walking round the block with Jeremy. She claims they went through the statements which really means she claims Jeremy had asked her what she said in her statement. It doesn't say he told her what to say
You don't go through police statements once you have given them as a witness.They wouldn't have had a copy to compare them. Statements are taken by police. Even if this is true he is just asking what she said.
The diary looks scripted to me