Leisure centres

So one of the hard to find bits of information when booking a hotel is how extensive the leisure centre is. I like to find hotels with a sauna or steam room in the leisure centre, but it is often difficult to tell if they are in common spaces or in the change rooms. I pose the question, what are your favourite hotels with separate men's and women's saunas or steam rooms?
The two I know of are down near Gatwick airport. The Rennaissance hotel has a pool and small change rooms with saunas in them. The Copthorne Effingham (the one with the golf course) has sauna and steam in a large wet are in the change room.