Hi, looking at replacing our Hypnos Churchill mattress which I believe is a 1200 spring two-sided (medium & firm) wool/natural fibre product. Was wonderful but now past its sell by date. I am looking at the outlet stock and it seems to me that the Bespoke 004 would be a nice upgrade for the outgoing product. Would this in a medium spring be the right product for 5'2" wife at just over 9 stone and 5'9" husband at 13.5 stone? We would be putting it on the sprung edge Hypnos divan base. Thanks!