This is the old Millennium hotel on Grosvenor Sqr where the American embassy was. To become the first LRX hotel in Europe. According to an article the hotel has been closed for refurbishment since June last year and they spent 50m GBP on it. I did a quick search and the cheapest rate I found was £383 pre-paid on a Friday night. Lowest award rate 95k points. Beautiful but out of my range.