Geeker, if you are still around, you said that 19 is "an anagram of two referenced solutions". I don't think it is; it's an anagram of two words which aren't solutions.
I found this very disappointing, as it was too easy. In fact I have never before found a Guardian prize so easy, and rarely found a Guardian weekday crossword so easy. That was despite being at the disadvantage of knowing virtually nothing about the theme, which to me is, unfortunately, very uninteresting. I would never have realised there was a theme if people hadn't said so. However, even I know just about enough about the theme to spot a small number of theme words once I put some work into looking for them, and then confirmed several mor via Google. I see 5d and 23d as very weak clues, especially 23, which belongs in some far lower-level crossword venue than the Guardian. Not at all what I expect from Maskarade. Oh, well...