Hi Geeker,
Well, as if this wasn't tough enough already, I had to go and put in the wrong (but better fits the wordplay?) answer to 22a (see below) and, inexplicably, 20d -"knuckle"!? This made solving the SE corner impossible, so I knew I had most likely gone wrong somewhere.
Like you I had trouble teasing out the theme, but somehow managed to get the related 16, 6,2 and 10,24 before I got 1 across, although they obviously helped in pointing me in the right direction.
If you do get stuck there is at least one long anagram and one hidden, both in the downs.
22a - this is the only clue in which I still have a ? over the wordplay HOLD THE PHONE!! it say "gasping" not "grasping" - problem solved and note to self - read the @$?& clues properly!!
COD - I'm going with the minimalist and elegant 19a - Lector's failed to notice a title (6)
Thanks to Paul to a very challenging but rewarding crossword.
Looking forward to reading the views of others - did you find it as difficult as Geeker and I or were we just off the pace today?
Stay safe:-)