Hi,
bizzylizzy. I have a Nestledown Support-apaedic (think I've spelt that as it is on the mattress). It is the best bed in the world and like sleeping on a cloud.
I've always had a bad back and although it's pretty soft, I sleep as though I'm dead! Everyone who has ever slept in it (not like it sounds :)) has asked me where I bought it from and said how well they've slept on it.
The divan that it came with is also sprung, which I'm sure helps. I've had it for five years now and I think it was priced at �1000, but reduced in the sale to �400!
Their site is being updated at the moment, but I'm pretty sure I got it from Dreams.
http://www.nestledown.co.uk/
I know what it's like to sleep uncomfortably, as my boyfriend's bed is awful. He spent hundreds on his mattress, but it's awful. Hope you have a comfy night soon. :)