Having raised the question of authorship and having now completed the puzzle, I'm none the wiser. I take alwayspuzzled's point about structural similarity to Fieldfare's 2596 last week and also jazzgirl's suggestion that some of the clues have a tang of Doc (who, in the normal course of once every three weeks, is due next week) but I wouldn't like to put money on it either way.
Perhaps we'll never know for sure.