Barbene: I did the same at London Park Lane. Could have saved 200 Gbp if I had waited with the booking. Anyway, I tried to e-mail the hotel and asked if they culd match the new price, but of course, they couldn't...
It was really irritating that day and the day after, but that's life and instead of thinking about it I am looking forward to my stay!
However somebody told me I could try to cancel the stay, but I never tried. You might try that.
xxx.