[Packets] No...? Yees...? I suspect that's too close to call nowadays. Nevertheless, solid clappage occurs

[Sugar chair] No.

[Supermarkets] Supermarkets may be pretty comprehensive, but they don't sell everything. I'd only expect this to show up in the biggest supermarkets (and the right specialist shops), so when asked about 'normal' supermarkets I said no. I don't think Twickenham Waitrose has 'em, for example, and that's a good-sized shop. But for Kingston Waitrose, which is quite a bit larger, I reckon the balance tips. You all need to tell me the precise square footage of your nearest supermarket, then I'll redo the calculations. :-)

[SM's Mat Mystery] No, not Lambert. Besides, my government name is neither Mat nor Matt.
Are they mostly used for commercial purposes? The supermarket thing had me believing it was some industrial ingredient only used in factories, so let's tease that one out if we can.

My favourite...

I thought of Fisherman's Friends a while ago, but the dating doesn't fit.

[Commercial] Yes. At least in the sense I think you mean. They're things people can buy, but unusual enough that only a larger-than average supermarket would stock 'em.
[Restaurants] No.
[Pastilles] No.
[They're starburst now, bah] No.
[Medicinal] No.

Sorry, rereading Mat's query, I think I ought to change that to a No. Overlooked the word 'purposes'. This isn't, e.g. catering supplies, it's an ordinary thing bought for or by its end-user.

[Cake decor, dragees] No and no.

[Individually wrapped] No.

[Spherical] Yes! Strong applause

[Diametrics] Yes! More applauses, possibly even whoops

standing on the shoulders of giants

[Gobstoppers] Yes! Gobstoppers is the AOTC. Audience collapses in relief, and they're probably not alone By Jove you had to work hard for that one. I was genuinely surprised that no-one thought to ask 'Sweets' weeks ago.

---

I think a lot of us were focused in on sweets for a long time, even if we never asked the question specifically. (That was my focus of attention ever since your reply when I asked if sugar was an ingredient.) The "no" to boiled sweets, though undoubtedly a correct answer, may have ended up taking us away from the right line of thinking.

MINERAL

Marbles? No.

Hidden text

''Unlike the ones from the book and the films, where Willy Wonka says you would break your teeth if you tried to chew a gobstopper, the Nestle produced gobstoppers are chewable once sucked long enough, and unlike their fictional counterparts they are not everlasting.'' Remarkably, that does not have a [citation needed].

Unique? Yes.
Metallic? Yes. *some muttering and head-shaking in the audience*