Thank you for the response - it helped and I got it! :)
Useful to know about the phone contacts - thought I was missing one so had been spending ages trying to get it XD
The police files were definitely the sticking point - I thought I needed a full name for D and had tried asking full names without luck. Turns out I needed to put 'file' at the end *doh*
All in all a wonderful game with just enough twists and subplots to really get my teeth into without it feeling super unfair :D