"Hermanos roast their own Colombian beans, traceable to named farms, and serve filter alongside espresso at the bar. Ask the barista what's on today: they know the origin story and will tell it."
127 Portobello Rd, London W11 2DY, UK
LIFT roasts under a numbered lot system, sources direct from named producers, and sells retail from the counter. The espresso is funky and fruity; the kind you describe by what's in the cup, not the postcode.
The owner roasts his own beans, tracks them to specific harvest lots, and pulls every shot from a kiosk inside Latimer Road station. Brazilian single-origin, rich and nutty, and he'll tell you which harvest you're drinking.
Climpson & Sons out of a Notting Hill hatch, in a stripped-back espresso setup. Retail beans on the counter if you want to take the roaster home.