Tucked behind the impossible chaos of London’s Oxford Street, this modest oasis sells fine, unusual teas, with the maker or estate’s name and place of production marked on every tin. Kaikado of Kyoto tea caddies, exquisite as sculpture, are displayed in vitrines, while in a lower level space, covetable teapots from respected artisans of China and Japan are exhibited. Timothy d’Offay and company are engaging and articulate. Sit down for a cup and a conversation. Send home a “postcard” of tea. And leave feeling calm and refreshed.