Hi all, just a word of caution I had a new mattress made for my fixed bed in my caravan by a Birmingham company who were at last years caravan and boat show at NEC sprung with a memory foam top. Very nice however very heavy so now I have to replace the bed again because the company made a mattress far too heavy I have since found out that the mattress weight should have only been 14kg So if your thinking of replacing contact your manufactorer for the weight