Hi JacqCud,
Welcome … and I’m glad you found us :).
Just in case you haven’t found it yet … the first place to start is the mattress shopping tutorial here which has all the basic information, steps, and guidelines that can help you make the best possible choices … and know how and why to avoid the worst ones.
Post #2 here also has more information about organic, natural, “safe”, and green mattress materials that can help you decide on the types of materials you are most comfortable having in your mattress.
The better options and possibilities I’m aware of in the London area (subject to the guidelines here) are listed in post #8 here.
Phoenix