Did he say he was in contact with these police sources?
If you would take trouble to read the link I have provided perhaps you would be able to make up your own mind about that.
Snip21: Despite the barriers thrown up by the Portuguese criminal justice system, I was able to obtain an accurate and truthful insight into on-going developments within the police investigation at that time.
Indeed, by this point in time, one of my contacts was informing me of day-to-day developments as they were taking place and before they were being written about in Portuguese newspapers.
This enabled me to verify the accuracy of the information I was being given.
For example, I was told of a series of operations and searches that would be taking place at particular times and on particular days- and was able to personally witness these events taking place.
http://www.levesoninquiry.org.uk/wp-content/uploads/2011/12/Witness-Statement-of-David-Pilditch.pdf