Coming back very belatedly to the forum: I found most of it very easy, apart from 19d, as I know nothing about Tarot and had to google the whole list of cards to understand the hints. A few comments.
I am familiar with the Law associated with12a, and remember an example of it. I was filling a length of plastic tubing with water to make a water level. It was full of bubbles which had to be removed. As they floated up small ones joined together and instantly their speed changed. Fascinating.
24. An old-fashioned word and concept which was very relevant to a constitutional crisis in the late 1930s. As a boy then I remember singing and chanting "Look who's coming down the street, ... ... with her sweaty feet." Very irreverent.