My parents liked to visit the ones called Historic Hotels in the brochure as they were more like a 4* hotel. They didn't go to any of the Coastal Resort hotels as they were like glammed up Warners holiday chalets. I went with them several times. We visited all except the one on the Isle of Wight.
Favourite and best by a long way is Thoresby hall near Nottingham.
Least favourite was Alvaston Hall near Nantwich. Mainly because of the lack of outside space meaning they didn't have the outside activities that the other places had.