Best for: Unrivalled spa facilities.
Located in the basement of the five-star Corinthia hotel, just a moment from Trafalgar Square, the ESPA Life spa is a monochrome cocoon of sheer relaxation. Book in here and you’ll get to enjoy the vast Thermal Suite, which is a black-marbled sanctuary home to a large steam room, plunge pool, jet pool, ice fountain, heated loungers and, the pièce de résistance, a glass-walled sauna amphitheatre as its centrepiece. If you opt for a treatment on your visit too (which are absolutely worth splashing out on – they’re up there with the capital's best), we recommend either a personalised massage, or a back, face and scalp treatment.