Perpetually busy pint-sized Lamb & Flag is full of charm and history, and has been a public house since at least 1772. Rain or shine, you’ll have to elbow your way through the merry crowd drinking outside to the bar. The main entrance is at the top of tiny, cobbled Rose St.
You can also reach it from the backstreet donkey path called Lazenby Ct that will temporarily transport you back to Dickensian London. Watch your head.