Hi Barbara.

First of all I would not unduly worry about the chemical make up of foams or Memory Foam or indeed any man made composites.

Our homes are full of the stuff - in your sofas, in your carpets, in your bedding, your duvets, your pillows and so on.

If there really was anything radically wrong it would have come to light years ago.

Your choice of mattress is of course limited.

There is no possible way you will get all you require in a mattress without doing a little jiggery pokery of your own.

The best way to spend your money is buying your support - fortunately for you, your bodyweight requires very little and I would suggest something like The memory Sleep from Matttressman at £168.

for the Double Size.

This by itself will not be substantial enough to offer a great degree of longevity - the memory foam part is just 3cm but for the price you cannot expect any more.

You will need to add something on top of this that will take the wear and tear and at a minimum I would suggest you place a Value Pac Duvet from Tesco at about a tenner (online).

Cover this with a cover and strap it all together with a fitted sheet.

Obviously, the duvet will flatten within a few months (all hollow fibre does) but it will be more economical to replace this every once in a while than to replace the entire mattress.

Hope this helps Barbara, let us know how you get on.

John and Ryan.