Gramos Coffee Bar (underground, sub-level -1)

One level below the King's Cross rush, this subterranean roastery pairs global bean-sourcing with a proper dedication to the flat white. Gramos roasts its own speciality-grade coffee and serves hundreds of commuters and locals daily from what feels more like an underground workshop than a traditional café. Regulars return for the consistency — and for what several insist is the best flat white in London.