Para377, there is a rather large incentive for Government to enforce model litigant rules on itself. Its called trust.
As Francis Fukuyama wrote in his book : "Trust: The Social Virtues and The Creation of Prosperity", without trust the economy is poorer because transaction costs of doing business skyrocket, often to the point where no business can be transacted at all.
I would argue that if the lack of trust of CASA is as endemic as Pprune folk would have us believe, then look no further for the cause of the decline of the Aviation industry.
You cannot invest, employ and grow any business if you cannot manage the business risks involved and one of those risks is capricious action by CASA. The only way to mitigate that risk is through a robust defence in an unbiased Court of law, but CASA has already shown itself, if Pprune is to be believed, that it will not play by the rules.
To put that another way, what person in their right mind would want to start an airline let alone manufacture a certified aircraft in this country?