Since it's been mentioned, I'd like to put in a word for the Stroke Unit at Northwick Park Hospital. My dad had a moderately severe stroke back in October '02 and was carted off (more or less immediately - a good move) to NPH, which was local. The staff and facilities there are excellent and they looked after him brilliantly. He made a 70% or so recovery and lived three more years.
The fact that he made my mother's life a misery during those three years is another matter!