I have read this question many times on lots of Forums even seen complaints about one of these holiday camp resorts in the area, think it might have been the Tuana, peope saying there was suppose to be a heated pool,but it was freezing cold.
I see the problem being, owners will not be bothered to heat pools off season, not enough tourists, when it is the season and lots of tourists, pools heat up by themselves in the lovely weather. It's catch 22