Don't betray your sources through financial expense claims or payment authorisations
The notorious Operation Eleveden which has wasted millions of pounds on prosecuting mainstream newspaper journalists and their sources,
and their (often paid) journalistic sources in the police and other public sectors has had a chilling effect on investigative journalism in the UK.
Many of these cases involve the betrayal of their own journalist and their supposedly confidential sources by Rupert Murdoch's New International
corporate damage control, who handed over thousands of emails and financial payments records to the Police, which were then used to identify and then prosecute dome of the journalists and their sources in the Police or NHS or other public bodies.
There were many arrests, often without any eventual prosecution, but including dawn raids, seizure of computers and phones, DNA & fingerprints etc.
If you have taken note of the other hints and tips on this website, please do not spoil it all by submitting detailed expense claims for travel or meals or other credit card transactions which will place you at a certain location at a certain time, when you may have been meeting a confidential source face to face.
N.B. direct payments to sources for exclusive stories are an obvious risk, but Electronic Banking or funds transfer payments to their relatives' or partners' bank accounts have not fooled the Police investigators.
UK Police forces have often used their Regulation of Investigatory Powers Act 2000 communications metadata snooping and analysis powers, to track down
the confidential sources of journalists (some from Murdoch group newspapers, some not) in pursuit of insider whistleblowers, some of whom they only ever dealt with through internal disciplinary procedures without any criminal prosecution.
Try not emulate the poor Murdoch group journalists and do hide the money trail involved in dealing with your confidential or whistleblower sources.
Obviously not all journalist / blogger / activist source relationships involve financial payments, but these can still be betrayed by financial records.
Insist on Cash for deliberately vague expenses claims.