Difficult to say. First of all I believe The PJ saw a reason for why the handling of the original investigation needed looking into. And then in the process of doing that they found things that were neglected and needed a closer look at.
What will have followed is obvious.
I agree with you, Eleanor, though I'd like to look into the matter of exactly why they decided to re-open things when they did.
Their 2011 review began just
before that of SY - officially at least.
The way we often look at the investigation in Britain is that SY, in motivational terms, are the ones driving the investigation. They are appealing to Portuguese authorities for green lights in carrying out certain diligences, and have a team of officers acting on their 'behalf' in Faro (not sure what that means exactly; perhaps someone can confirm).
But if the early groundwork for a new investigation was actually laid down in Portugal, what does that tell us about the relationship between UK and Portuguese authorities in this case? Are SY really pushing the PJ and others to do things, or is that motivation coming from within?