Pop into any antique store in the country and you’ll likely find at least one porcelain doll sitting on a shelf (probably next to the vintage figurines). But how much are these delicate dolls worth?

Pollock’s Toy Museum is one of London’s loveliest small museums, a creaking Dickensian warren of wooden floors, low ceilings, threadbare carpets, and steep, winding stairs, housed in two connected ...