Gordon's Wine Bar at Embankment
Duck through an unmarked doorway on Villiers Street and descend a narrow staircase into a low, vaulted brick cellar lit almost entirely by candles. Walls plastered in yellowed newspaper clippings, faded sepia photos of Victorian royalty, old oak barrels of sherry and port lining the back. Tables are tiny, wedged knee-to-knee. Order at the bar (wines by the glass, cheese boards, charcuterie) then queue for a cellar nook. London's oldest wine bar, opened 1890. Romantic in a "we discovered this" way, even though everyone knows.
Sunday: Open 12pm–10pm, no bookings. Arrive before 4pm to bag a cellar table comfortably: it fills fast post-5pm.