Blogger Guido Fawkes is encouraging whistleblowers to come forward by offering them the following protection:
"If you call the voicemail number your speech is converted to text and SMS'd to Guido's mobile phone. Your voice is then erased. If you fax a document to Guido it is converted into an image file and emailed to Guido, if it is going to be used all identifiers are digitally removed, often by converting the fax image to clean text using optical character recognition software. If you want to send an untraceable encrypted email, Guido recommends using Hushmail."
This might be useful advice for any journalists working within the Thames Valley Police area (see post below).