Kioku by Endo

A Whitehall Address That Changes the Stakes

The Old War Office on Whitehall is one of the more theatrical restaurant addresses in London. The Edwardian baroque building, which served as the nerve centre of British military command for much of the twentieth century, was converted into a Raffles hotel and opened in 2023. Sitting on its sixth floor, Kioku by Endo arrived as part of that opening wave — a rooftop Japanese restaurant positioned above one of the most historically loaded streets in the country, with direct sightlines across the Thames to the Houses of Parliament. The address alone sets an expectation that most new openings would struggle to meet.

What makes the location editorially interesting is not the view in isolation, but what Whitehall represents as a dining neighbourhood. This is not Mayfair's established luxury corridor, where Zuma and comparable upscale Japanese operations have long competed for the expense-account and hotel-guest trade. Whitehall sits at the intersection of government, tourism, and a newer wave of hotel-anchored dining. The OWO's arrival has shifted the SW1A postcode into serious restaurant territory for the first time, and Kioku is the flag-bearer for that shift on the Japanese side of the menu spectrum.

The Menu: From Fusion Experiment to Japanese Focus

When Kioku launched, the kitchen worked a Japanese-Italian fusion format — a direction that has since been abandoned in favour of the contemporary Japanese cooking for which Endo Kazutoshi is better known through his Notting Hill operation, Endo at the Rotunda. The pivot matters: fusion conceits can work at mid-market price points, but at the ££££ tier occupied by London's most recognised tables, CORE by Clare Smyth, Restaurant Gordon Ramsay, Sketch, The Lecture Room and Library, and The Ledbury, diners arrive with a high bar for coherence.

The current menu structure is à la carte, with a 'Taste of Kioku' option available at £150 per person for those who prefer a set progression. The kitchen runs a format built around nigiri, sashimi, and robata-grilled prime meats and fish, the core vocabulary of high-end contemporary Japanese dining in London. Desserts take a deliberate western turn, with items such as White Chocolate Tart and Strawberry Mille-feuille signalling that the kitchen is not attempting a purist Japanese close to the meal. Whether that reflects a practical concession to the hotel-guest demographic or a considered editorial choice, the effect is a meal that is Japanese in its savoury architecture and European in its sweet conclusion.

Awards and Critical Standing

Kioku holds a Michelin Plate for both 2024 and 2025, the Guide's recognition that a restaurant is producing food worth seeking out without yet reaching the star threshold. At a building like the OWO, where the property itself carries international-hotel prestige, the Plate signals that the food is doing independent work rather than coasting on the address. The restaurant is also ranked 514th on the Opinionated About Dining Leading Restaurants in Europe list for 2025, which places it within a broader field of recognised serious European dining, a useful calibration point given how recently it opened.

For context, the OAD ranking system leans on frequent-diner submissions rather than anonymous inspection, which means it captures a different signal from Michelin. Appearing in both systems within the first two years of operation points to a kitchen that has found its footing faster than many hotel-anchored openings manage. Hotel dining in London at this price tier has a mixed record of translating location prestige into genuine culinary recognition; Kioku appears to be threading that gap.

The Terrace and the Rooftop Arithmetic

The physical experience at Kioku divides across two modes depending on season. Inside, the sixth-floor dining room faces the parliamentary skyline; outside, the terraces extend the view and shift the atmosphere toward something more aperitivo in character. A separate, more abbreviated menu operates on the terrace, which suggests the kitchen treats the outdoor space as its own format rather than an overflow annex, a distinction that matters for guests deciding whether to book during warmer months for the terrace specifically or treat it as a secondary option.

The ground-floor bar within the OWO building is an established pre-dinner move, offering cocktails before the lift ride to the sixth floor. That vertical separation between bar and restaurant mirrors how other large hotel properties structure the arrival sequence, and it gives the evening a clear two-act rhythm that works particularly well for special-occasion dinners.

Pricing and When to Go

At £150 per person for the 'Taste of Kioku' tasting menu, Kioku prices at the lower end of London's top-tier Japanese dinner market, where omakase counters in Mayfair can push considerably higher. The à la carte format offers more flexibility, and the three-course lunch at £55 per person represents genuine value relative to the address and the dinner price architecture, a point that reviewers have noted directly. Lunch also tends to give the leading return on the terrace experience during summer months, when the light across the parliament roofline is at its most useful for the view.

For broader London planning, hotels, bars, and experiences beyond Whitehall, see our full London restaurants guide, our full London hotels guide, our full London bars guide, and our full London experiences guide. Those exploring the wider UK dining scene should note that Michelin-starred destinations such as The Fat Duck in Bray, L'Enclume in Cartmel, Moor Hall in Aughton, Gidleigh Park in Chagford, Hand and Flowers in Marlow, and hide and fox in Saltwood represent the depth of serious cooking outside London. For Japanese contemporary cooking elsewhere in Europe and Asia, The Japanese Restaurant in Andermatt and Eika in Taipei offer useful reference points. Wine-focused visitors should also check our full London wineries guide.