W Hotel is part of the Marriott. So, if you haven't yet, get yourself onto their Marriott Bonvoy Loyalty program. Away Spa:
They have tailor-made treatments and services plus a GYM, sauna, and steam room.
I had an amazing massage here personally! You're in the heart of London, and it does feel so quiet and zen when you enter. However, it is small, and I would only suggest coming for one of their experiences (it's not an all-day 'Spa' sort of thing. More treatment rooms with a few extras).
Try their Detox Retox £150 package:
You have use of the gym and sauna / steam room 1 hour before or after.
--> Light or hard workout in the gym 1 hour before 💪
--> Take one of their health kick shots
--> Sauna and Steam room it
--> 1-hour massage or facial given
--> A free cocktail is included, too. Once you've changed, sip sip away.
--> Head to China Town for an early dinner
--> Then attend one of the many West End Theatre shows in the evening.
Valentine's Day and Mother's Day are coming up, for which you can buy as a gift, for example.
Let Lady PA organise spa days/days out for you. We can research, source, purchase, and send gifts on your behalf.
Lady PA saving time in your day.