The Dorchester

The Dorchester Spa is a slice of art-deco glamour beneath one of London's most storied addresses — all spotlights, mirror, and a certain old-Hollywood polish. One honest caveat: the Dorchester Spa's current amenities list carries no sauna — the sauna and steam live across the road at sister property 45 Park Lane, so confirm access before booking for the heat. The spa itself is as much about the ritual and the (excellent) treatments as anything. This is a spa for people who like to be thoroughly looked after, and the Dorchester's service is famously among the best in the city. The hotel above needs no introduction: Park Lane grandeur, big plush rooms, a lobby that's a London institution in its own right. It's traditional and indulgent rather than minimalist, which is exactly what its devotees want. Spa access typically comes with a treatment or day-spa booking, so arrange that when you reserve — the sauna is best enjoyed as part of the full afternoon.