I share the common view that this was an exceptionally good puzzle, so many thanks to Maskerade. You might like to know that a letter published in the Guardian on Tuesday said this as well.
What hasn't been said is many congratulations to all those who persevered and completed it! Whether you used Wikipedia, anagram solvers, help from this forum or other aids, getting to the end is a substantial achievement - well done to all!
(And as somebody said, let's hope for something similar at Christmas!)