Guillam Coffee House – Mayfair

Sourcing is the headline act here, with single-origin coffees from Brazil, Ethiopia and Colombia — each with its own tasting notes, from dark chocolate and hazelnut to blackcurrant — sold alongside brew-at-home kit so the ritual can continue beyond the counter. Doors open at 7 AM on weekdays, and there's outdoor seating for warmer mornings. A 4.5-star rating from over 200 reviews suggests this pocket of Mayfair has well and truly taken notice.