Because, Noggin, certain concerns were presented to one of the organisations referred to. They then asked for further information and a working group formed which reported to the head of the organisation. As a result, the organisation sent a letter to the Head of CAA SRG. Following the response to this, the CAA also wrote to AOPA and other organisations advising them to seek an industry consensus. This led to the first meeting of the NPPLSC at which the majority of the concerns were satisfactorily resolved and the proposed NPPL syllabus amended. Further progress was made this week. Hence the NPPL is now a workable proposal, whereas beforehand it wasn't.
In that NPPL students will probably now have to pass a NFT, most concerns about them being able to cope with mixed traffic in Class D airspace have been addressed.