Eel pie? Dennis Severs' House? Dig deep to find what's in London's other pockets

When I moved here 25 years ago, an Englishwoman told me that London was like her grandmother’s handbag: all hidden pouches and zippered pockets stuffed with sweets and lipstick. It would take ages to find a lemon drop or a bus ticket, but when she did, it was well worth it.

Nowadays, when I read...