Have you ever been somehwre unfamiliar on the tube

[Burney]

Does being leafy preclude a suburb from being a part of a much greater city? Surely the tapestry of London is, in part, down to its many, vastly different, districts?

But they're not suburbs. They're entities in their own right. The same (in a very different way) goes for Croydon. Croydon is technically London, but I grew up there and it's definitely not really London.