Why Brussels for a city break?
Brussels is one of the most underrated city breaks from the UK — consistently overlooked in favour of Amsterdam or Paris, yet housing world-class Art Nouveau architecture, the finest beer culture in Europe, extraordinary chocolate, and a Grand Place that Victor Hugo called the most beautiful square in the world. The Musées Royaux des Beaux-Arts holds Bruegel the Elder's most important paintings. The Atomium is one of the most distinctive pieces of 20th-century architecture. The frites are, definitively, the finest in the world.
From London it's an hour by air or just over two hours by Eurostar direct to Brussels Midi — one of the most civilised city break journeys available, arriving in the heart of the city without an airport. Brussels is compact, walkable and genuinely affordable by capital city standards. April through June is perfect: the Grote Markt flower carpet (every two years in August) is extraordinary, and the city's outdoor café culture along the Place du Grand Sablon makes spring and early summer especially pleasant.