Donostia Restaurant

You're walking up Seymour Place in Marylebone and stumbling into something genuinely different. Donostia brings the swagger of San Sebastián's food scene to a neighbourhood that usually plays it safe. This is the kind of place where they've clearly thought about every detail—the bar's lined with pintxos, there's a proper kitchen doing things with fire and precision, and the wine list skews Rioja and txakoli. It's not trying to be cool; it just is. Expect to spend a bit (reckon £40-60 before drinks), but you're getting proper Basque technique, not some diluted London version.