Six Senses London

Six Senses brought its serious wellness pedigree to London inside the restored Whiteley building, and the result is one of the most ambitious hotel spas in the city — a sprawling subterranean world of saunas, steam rooms, a Roman-inspired bathing circuit, and a generous pool. This is heat as a proper journey: you move between temperatures and treatments, taking your time, the way the Nordics and the Romans always intended. The brand's whole ethos is wellbeing-first, and it shows in the thoughtfulness of the layout. Rooms above are calm, natural, and beautifully done. For sheer range of heat-and-cold experiences in a brand-new, purpose-built setting, it's quickly become one of London's best. Guest access to the spa circuit is included; it's deservedly popular, so book your thermal time alongside the room.