... white or cream turtleneck, in wool or cashmere or a blend (a small amount of man-made fabric in the blend is OK too), in size 36/XS/equivalent, suitable for wearing under a jacket, not terribly chunky but not too fragile/tissue-thin either. Brand is irrelevant, as long as the logo isn't of Big Pony dimensions; I don't mind normal-sized logos if it meets the other criteria. This is to replace a cream cashmere crewneck that's seen better days and always fit a little too big anyway as it was an 38/S rather than 36/XS. It's the kind of basic, versatile thing M&S used to put out every year, but hasn't in recent times.
Price: preferably under £150 but would go up to about £300 if it's cashmere. Wool at a lower price is definitely preferred though. I'm certainly not paying the unearthly Loro Piana baby cashmere prices, for example (besides, they can be a little too thin sometimes).
I've failed to find one that meets all those criteria so far, either from the internet or the high street, but maybe you guys know of a source. Thank you SF!
(And if you like, feel free to also use this thread to get SF to crowdsource whatever item you're looking for as well. Maybe we can all help each other out. )