The DfID response to my latest FOI request says that there are over 3,000 DfID projects which have had their performance assessed and recorded on the database.

They say they won't publish it because it "supports the operational management" of the projects (rather than being "key project content").

I've asked them for a data dump of all the records relating to these hidden fields. Once it's released, it should be possible to do a mash-up with the already-published information in the PPI.