I believe that if you have a foam mattress you shouldn't have to turn or rotate it. I find foam very comfortable, but also too hot for me as I'm a very hot person!
I'd recommend a trip to John Lewis to try out mattresses, we've always bought there either during the sale or ex-display. They have the option of returning the mattress within a certain timeframe if you don't like it, though you have to put on a certain type of mattress cover which you buy at the same time.
Shops will obviously try to sell you a base as well as a mattress if they can, but it really isn't necessary as it sounds as though yours is the unsprung type if it has drawers.
Whatever happened to polo necks?
Has Trump completely lost what was left of his mind?
Judge Orders Trump To Appear For Deposition Hearing Or.......

