some interesting background Googling
"News of the World .. allegations of widespread illegal phone-tapping at the paper"
Not hacking or `phone-tapping' but illegal or unauhorized access of voicemail, unless there is more to come out. The question remains just who give the NotW the phones numbers in the first place. And were such practices common to other newspapers before-and-after the Dowler case.
"An IPCC Deputy Senior Investigator has been over at Surrey Police this morning to get more information about the case and will be writing to the Dowlers' solicitor at the family's request,"
translation: We're going totally lukewarm on this one and hope that such evidence that may exist will dissppear into the mists of time, like these NotW emails that got lost on the slowboat to China"
Missing Milly `hoax' outrage, NotW April 2002
Hugh Grant and the NotW reporter, April 2011
Milly 'leak' detective was removed, July 2011