I can't be the first, surely? I can't remember when I last sat in front of a Listener for so long with so little idea of what was going on. My first trawl through the clues produced virtually nothing let alone any insight into the mechanics indicated by the pleasantly short preamble. But with patience it all gradually fell into place and I've now completed it and parsed all clues - some of which are pretty hard to crack. But it all works out nicely in the end and proved a real challenge even without a theme in the sense that we generally understand it. Many thanks to Gos!
Simple concept, hellishly hard clues! Despite working out what was required quite quickly I progressed at the rate of a lame snail carrying a ton of bricks, although it did get easier towards the end.
When searching for a thread I came across the comments on Gos's previous puzzle, 4309: Shades Of Green. The general consensus was that the clues were too easy. I don't think anyone can say that about this one!
An old school puzzle which provided a challenging and enjoyable workout.
I felt a number of clues in the first set had been forced because of the condition imposed, and were poor. Nor was there any compelling logic to the second set. This became a bit of a grind. I thought the preamble was perfectly acceptable, though, and described the puzzle exactly.
Agree with much of the above, tough clues and I’m still trying to parse 1ac although the answer is clear. I like that the Listener still has room for the occasional puzzle where the theme is in the entry method and there is no need for further reference - I think Waterloo did a couple a few years ago.