It's not so much the law being fluid, it's more a case of it being applied and interpreted as per the spirit in which the legislation would have been passed.
I'd say I pretty much disagreed with it all, but I didn't take notes on which was reasonable and which not.
I may look at it again, but still feel that the courts traditionally know the areas they should judge on and those which are in the political domain and leave well alone.
The judges views all rested on their personal opinion regarding that which was a private conversation between the PM and sovereign which they could not know but still claimed to be deception, and a judgement that meant they decided what was too long a break when, as far as I am aware that's not defined anywhere. And thus we return back to it being a political decision not a legal one.
In effect they are making law by coming up with these decisions, claims, interpretation and creating a precedent.