Perhaps I can expand a bit on my suggestion of a Federation proposal for a PGD Act.
I recently went to a water heating conference in the USA. At the conference the US regulator announced a proposed new test method for water heater energy consumption and a relatively short consultation period. Like all these consultation things the chance to get any major changes made is pretty slim by the time it gets to this point. They are only really making sure that someone doesn't point out some huge flaw that they haven't thought about.
Over the previous few years two of the organisations in the US have developed their own water heater test standards. Not one water heater will ever be tested to these standards and they and the people developing them knew this would be the case. The reason they did it was to try to frame the discussion and highlight the areas where the current standard was faulty. They trotted their standard developments around various meetings over the past few years and refined them and this had the effect of getting focus on the issues that were important to the industry so when the DOE developed a new standard the major issues were addressed. Not in the exact same manner as either of the industry standards but at least in a way that everyone can live with.
Over a long period of time this has been proven as an effective and positive way to try to set the agenda and engage with regulators and politicians. If you wait for the consultation to start the argument is already framed in a way that tends to leave you arguing about the consultation structure rather than anything else.
You could just start with the high level topics which you feel need addressing and then populate them out with everyone's input as you go.
A starting list in no particular order might be:
Classes and scope of licences
How competence is initially demonstrated
How maintenance of ongoing competence should be demonstrated
Structure and role of an Industry regulator
Cost of industry governance
Prosecution of unregistered/unlicensed persons.
Prosecution of licensed persons.
There is of course no guarantee of success with this approach but it has been effective elsewhere.