An excellent puzzle, and a reminder of how much this great setter will be missed. I was actually "partaking" of an item by the subject (not one from the puzzle) when the penny dropped - a lovely coincidence. This was still quite a stiff challenge with the theme known, and it was a joy to have a puzzle that relied mostly on solving clues and didn't involve grid-staring. Great stuff.
As for use of the Internet: the guidance for setters states that "...availability of thematic information at a website is not a sufficient justification of accessibility. There is no ‘quality control’ for much of the data." The information needed for this, and other puzzles, can almost certainly be found in reliable reference works, so technically there's no inconsistency. But of course most (all?) of us take the easy option of an online search, which no doubt is why there is - or seems to be - much more "obscure" stuff than there used to be. I was solving Listeners in pre-Internet days and from what I remember, a single-volume encyclopedia and the works of Shakespeare were enough and I never had to make a trip to the library. That certainly wouldn't be the case now!