No, Portugal either accepts SY's help in the form of a joint investigation or choose to go it alone. As was pointed out by Cornelius, Sy would be Robin to the PJ's Batman.
Did Britain ever come up with the documentation in the form of financial details and medical records that Portugal asked for 7 years ago?
The PJ didn't ask for Madeleine's medical records. They asked for her dental records - which were supplied by the Home Office.
From the PJ files:-
Quote
11. Page 57 (PJ RefXVII) Request to provide Madeleine McCann's dental records. A copy of the dental records was obtained on 15th May 2008, and is enclosed. A statement producing these as an exhibit is also enclosed.
End quote
According to Correio da Manhã it was the Public Ministry who decided that the PJ should not have access to Madeleine's medical records.
Quote
Correio da Manhã 1,paper edition, 21.07.2008 Translation by astro
Clinical records - The Public Ministry decided that the PJ should not access the clinical records of Madeleine and the twins Sean and Amélie. The prosecutor sustained that such would violate the privacy of the children and their parents, and the evidence might be considered null. For the magistrate, the request was not duly sustained, either.
End quote.