Hi grayson.w,
Welcome to the Mattress Forum! 
The Emma is a new “simplified choice” offering in the UK. They unfortunately don’t list any meaningful specifications on their web site about the componentry on the inside of the mattress. The layers are as follows:
Airgocell foam (4 cm) – they don’t state if this is a high performance polyfoam or a memory foam
Small pocket springs (2 cm)
Memory foam (3 cm)
Polyfoam support core (16 cm)
In order to make an informed mattress buying decision, make sure that you find out the information listed here so you can compare the quality of the materials and components to the durability guidelines here to make sure there are no lower quality materials or weak links in a mattress that would be a cause for concern relative to the durability and useful life of a mattress before making any purchase. If you’re able to acquire that information and post it back here I’ll be happy to provide commentary about it.
I’m not sure what you’ve read since you found the site but just in case you haven’t read it yet … the first place to start your research is the mattress shopping tutorial here which includes all the basic information, steps, and guidelines that can help you make the best possible choice … and perhaps more importantly know how and why to avoid the worst ones.
Phoenix