Hi Stephanie,
 
Thank you for your question.
 
Sprung slatted bases can cause a problem in that they can cause a hump to appear in the middle of the mattress due to the mattress which is on the base being unsubstantial and lightweight that the arches on the slats are pushing the internal spring unit out of shape. By placing MDF or hardboard over the sprung slats, this will even out the base giving it a more solid feel.  
 
However, if you are still feeling your partner moving around on a pocket sprung mattress, the only way to totally eliminate this would be to have a zip & link mattress which are two separate mattresses that are zipped together. If using zipped mattresses in a bed frame, you will have to ensure the enclosure is slightly bigger than the intended mattress size. For example, a well built 6′ zipped mattress is about 6′ and 2 inches.
 
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If we can assist you with regard to any of our zip & link pocket sprung mattresses, please do not hesitate to contact our small friendly team who will be able to assist you with further advice and recommendations.   We would need to know body weights, heights and preferred feel in order to assist you in this mattress - 0161 437 4419.
 
Kind regards Julie