Indeed, i didn't wait for lastminute deals, i did not book the hotel because we were not sure to travel on wednesday.
Yesterday, we finally decided to travel, and i went on hotwire to find a good deal. Unfortunately, i was not able to find the hotel's name so I answered on the topic. This morning, the deal disappeared.
I will try once again tonight (perhaps there will be more offers ?) but for the moment, best offer is this one (also a "hot rate") :
4 Star in Bloomsbury - St. Pancras Station - British Museum area hotel
Boutique hotelBusiness centerFitness centerRestaurant(s)
Tripadvisor: 4 out of 5 (501 - 1000 reviews)
145$ instead of 268€ / night hot rate too
Thanks