For a long time — in fact until I actually did the blog — I thought that this was themed around 14ac 21dn and was prepared to apologise for my ignorance of his works. but it became clear that in fact the theme was more general. Hob has fitted in many answers with a link to the theme and I have probably missed some of them.
All very cleverly done and apart from my very occasional doubts, which are probably unjustified anyway, a pleasant crossword.