Dunlopillo Kontur Mattress

We purchased a Healthbed mattress 3 years ago because Which? gave it very good reviews. We previously had a tempur which was comfortable but made my husband too hot at night. The healthbed is an awful buy. It turned lumpy after 18mths and is only 5cm of memory foam and the rest cheap regular foam. It know dips in the middle. Needless to say we wake up with bad back and necks in the morning and I do not have this usually! Well and truly a terrible mattress.