Are you actually looking for UK journalists who know far more about the case than we do but can't print their stories because of media restrictions? Otherwise, you should be looking to the journalists on your home soil.
I am of the opinion that most UK journalists (can't say about Portuguese ones) are way behind on the pool of knowledge amassed by 'amateur' detectives.
Gordon Rayner runs a piece in the Telegraph where the opening paragraph states that we can be sure of only one fact in the MM case, namely that the police were called at 10.14pm on 3 May 2007. Both parts of this are in error.
The provenance of the 10.14 error can be traced back to around 9 Sep 2007 (Pamalam). It may be earlier but I have not attempted to find when it first surfaced. The source is said to be the McCanns. The Times ran with a piece in Sep 2007 saying that around 10.14 or 10.15, a friend went to reception to get the police called.
Quite clearly Mr Rayner is unaware that Matthew Oldfield failed to ensure that the police were called, and that the records show the first call was timed at 10.41.
His 'one fact' take is incorrect, given that the PJ Files can be used to build up a more detailed record of what was going on that day and that night.
Thus I am looking for decent quality, investigative journalists who, when supplied with an accurate dossier of known facts plus relevant questions and the logistics of getting answers to those questions, will attempt to obtain such answers.
I know that the Tapas 9, the Smiths and Berry/Balu are all sitting on pieces of information they do not consider to be important, when in fact they are.
My chances of getting such sources to communicate with me are about zero.
They just might be willing to talk to a journalist with a decent track record for fair reporting.