What a breath of fresh air the information on your website is! You don't mention the impact a base has, however. When choosing a mattress, how much does the base type matter? If the bed frame has a sprung base, this presumably will make the whole feel softer as the mattress isn't resting on a uniform flat surface. Should we be looking for slightly firmer mattresses as a result? We are a 9 stone lady (5'5") and a 14 stone man (6') who have struggled to find the right combinations. Our Superking Millbrook pocket sprung did us very well for 10 years on a hard divan, but was too heavy to turn and is now sagging a lot on my side. We have pretty much decided that two singles in a super king bed is the way forward, but current 'luxury medium' just feels like I'm in a dip all the time (not good for the neck & shoulders!). We need something with enough padding to prevent pressure/compression on my wife's hips and shoulders when sleeping on her side, but enough support for me. Any thoughts?