One last side note on this puzzle ...
The first 5 letters I managed to work out from the 9 four letter words were actually the last 5 in the theme word. This led me to check Chambers for all 9 letter words ending with those 5 letters - of which, there are precisely 8.
Of that 8, there were 3 that, for some reason, I thought were more likely than others - the correct one, the one directly above it (beginning e) and the one directly below it (beginning p).
So, in true methodical fashion, I set about putting each word, in the order in which they appear in Chambers, into Google alongside the title of the puzzle.
Imagine my surprise (and delight on a personal level - I'll explain later) when on my very first attempt I got back "Wallace Collection ........ ????????? Practice" - this must be it, I thought and, by way of confirmation, there is indeed a collection for other ????? instruments - not only that, but a picture of all those in the "collection"
See below - warning, possible
Spoiler Alert
https://thewallacecollection.world/
I could have stopped there but, given there were only 2 more possibilities I tried the next word and, of course, that was the correct one.
I only mention this because it is such a bizarre coincidence (I assume, or is Ifor aware of it?) that in such a very short list of possibilities, 2 consecutive words both, in one way or another, are part of a Wallace Collection!
Oh, and the delight I mentioned earlier - years ago I used to play the sax but when I moved into a flat I decided it was unfair on the neighbours so played it less and less and eventually got rid of it ( I did switch to the clarinet for a while but it just wasn't the same) - if only I'd known about the Wallace Collection back then:-)