The Barrel Vault - JD Wetherspoon

You're descending into the Victorian underbelly of St Pancras, where the original railway arches have been converted into a sprawling Wetherspoon with actual character. The barrel-vaulted ceilings—hence the name—are the real draw here; there's something brilliant about nursing a pint in these 150-year-old stone tunnels that once echoed with Victorian travellers. It's the kind of place that feels like a proper discovery even though it's technically in a major transport hub. The crowd's a nice mix of commuters, locals from King's Cross and Islington, and tourists who've stumbled down and realised they've found something better than the usual chain nonsense upstairs.