We ordered a new bed last year, king size. The sales assistant made a mistake and ordered 5' 6''. So they paid the difference since it was their mistake. However the problem we have now is - we find it very uncomfortable, despite it being a 'Vi Spring'. We wake up full of aches and pains after a night of broken sleep. I will be 60 next week and can honestly say I've never slept in a more uncomfortable bed. It's quite depressing since we thought we'd investeded in an 'excellent' bed. We've worked since we left school (a very long time ago) and just want a comfortable sleep! So could you please tell me how much it would cost us to replace the mattress with another 5'6'' X 6'6'' Thanks, Wendy Horn.