Hi, Hope you can help. My Partner is 14 stone and 5'9". I am 10 stone and 5'2". I suffer with siatic pain, particularly after a nights sleep, hence confirming our mattress needs changing. We have a Willis & Gambier slatted base and a Millbrook 1700 pocket sprung mattress. We have always chosen pocket sprung mattresses. We have struggled finding a suitable mattress for the both of us. My husband prefers a firmer feel. I could do with a softer top layer due to my siatica. We both do not like a mattress that would trap heat. I've been looking at the Hypnos Bedstead 3 mattress. We have laid on many mattresses over the past year, but invariably, one that I feel is just right is too soft for him! The situation is now desperate. I now have hip arthritis so a good mattress is essential! Your help would be much appreciated!