Cryptic crossword No 1,674

A hint to this grid's special feature is given in the reply to this comment, then the full answer in the reply to that.

This is a truly beautiful piece of construction. I'm amazed that it was possible while keeping the fill so clean, lively and connected. On top of that, the surfaces are all sparky and the good sort of painful. I saw the device and it helped me with the last bits, but it was all both smooth and challenging, both infuriating and entertaining. Thank you!

I really enjoyed this, Juff, cheers! Spoilers in reply...

Interesting construction, juff, and top marks for achieving the fill that you have. A few phrases/references that were unknown to me but, hey, you've had to deal with enough Britishisms when you've sold mine so it would be churlish to complain. Spoilers in reply. Thanks. PM

Thanks Juff for an incredible tour-de-force. I'm impressed with quality of the clues given the constraints you set on yourself. My top picks were 11a, 32a, 4d, 6d, 7d, 15d, 19d, and 25d. Spoilers in reply.

Thanks juff, an admirable construction - a couple of arguably borderline entries (20a, 19d?) but not *too* outrageous and enabling an amazing grid. A fair few raised eyebrows on the clues themselves, notably 9a's homophone but I guess that's a US/UK difference. Faves 14a, 28a, 15d, 17d & 30d. Thanks again!