were do I start with sleep to live 700... we bought the mattress 2010 and spent £1800 thinking we where buying a great mattress as me and my partner have back backs, I purchased the mattress and within 6 months I started noticing the mattress was sinking on both side of the bed... so went back to Benson for beds and they said was body impression... so left it another six months and went back to the shop and... before I mentioned what bed I wanted to complain about the lady in the shop new what mattress I was talking about... any way I explained to her it was like sleep in in a hammock and she explained need to talk with there customer services... so did this they sent a guy out to look at it he said the mattress should not be like that and will be in touch... got a letter explain form Benson for beds they are doing nothing more about it and there is nothing wrong with the mattress when you can clearly see its sunk... I have been sleeping on the floor ever since and had to go out now and buy a new mattress while I take this further.