Hi Aaron.

My personal thoughts on the 'specially made for slatted bedframes' thesis is that (quite simply) if you buy a two-sided mattress and do not turn it - then that is better than buying a one-sided mattress with minimal upholstery on the underside.

In the case of Silentnight mattresses (as opposed to say Vi-Spring for example) is that the underside of their mattresses have a firm insulator layer to keep the mattress stable on the slats - of course this is dependant on the actual model and please take this comment as a generalisation (I am not privy to their specs) but in all likelihood this will be the case.

I have a slatted bedframe and I have used three small pieces of MDF to bridge the humps on the slats to provide a flatter surface for my mattress.

I have also used an old topper to add an additional cushion to protect the upholstery on the underside of my mattress.

The 'specially made for bedsteads' matts are in my mind another avenue for additional models within a manufacturers range.

If you know what 'problem' you are trying to overcome then in many cases homemade measures can be utilised.

John and Ryan.