Thanks IanAlthough it does help a bit, we now think that the Raskelf is a bit over priced for whats it worth. We actually have a cheaper topper on top of the Raskelf topper and all is well.
Have a look at http://www.foamforcomfort.co.uk/index1.html Although not cheap either they offer a deeper mattress topper which can be cut to the outline of your mattfress if you have a fixed bed.