Good fun I thought. I recognised the theme without any real knowledge of it, but note now that the first part of the clue for 27 is a statement of fact.
Had exactly the same experience as others with LOI being 16. Concluded (perhaps incorrectly) that 22d was a triple definition, depends if you read the last three words as one, or in two parts.
Darla, thanks, yes indeed, makes a change from midnight. It’s on the list.