The Pool at The Montcalm London Marble Arch
The pool at The Montcalm London Marble Arch is mentioned by those who travel for a living. Out of 5 publications tracked on TripExpert, 4 referenced the pool, like Fodor's, Oyster and Lonely Planet.
The Montcalm London Marble Arch 
Fodor's
Oyster
Lonely Planet
Star Service
Fodor's "The small spa/wellness center has a workout pool and relaxing treatment rooms"
Oyster "Rooms at the nearby The Arch hotel probably have a nicer finish, and the overall vibe is less stuffy, though it is lacking a spa or pool"
Lonely Planet "The basement spa has a pool, Jacuzzi and steam room"
Star Service "Guests have free use of the wet room, which includes a sauna, steam room, whirlpool, a small exercise pool and several heated loungers—a serene place to relax and unwind"
