Hi Maggie,
Thank you for your question.
It may be that this mattress just isn't right for you in which case no topper that you purchase will resolve this problem for you. Perhaps it would be better to contact the company you made your purchase with directly and see what options you have to return it or exchange it for a softer model.
If you end up back on the market for a new mattress we would be happy to discus the suitability of our Origins and our Artisan range of mattresses.
I would suggest you take a look at our Origins Pocket 1500 as this is a fabulous all round medium feel mattress. The Pocket 1500 is our best selling made in the UK man made and natural fibre mattress. Offering a quality 1500 pocket-spring unit and layers of fillings for a medium overall feeling. Unbeatable value given its quality.

First Layer: 300 gsm Wool: This component is blended with (nominal amount) silk to give the primary layer beneath the fabric a gloriously soft cushion.
Second Layer: 750gsm Very soft Polyester: This coupled with the layers below brings the level of upholstery quite high. However, when compressed through tufting gives these layers a medium comfort but also has sufficient support by use of the springs.
Third Layer: 500gsm Polyester: This is the cushioning layer that acts as the dampener between the insulator layer below and the soft polyester that will follow.
Fourth Layer: One inch foam insulator: Directly on top of the spring unit we use a one inch layer of HD foam. This cushions you from the spring unit but also works with you enabling the pocket springs to rise and fall as you move.
The stretch knit mattress side panels are machine stitched . Traditionally hand tufted. Even though the mattress side panels are 9″ deep, the undulations caused by the abundant upholstery brings the mattress depth to a more realistic 13″.

I hope this information helps but if you have any further questions please do not hesitate to contact the office on 0161 437 4419.
Kind regards,
Amy.