6) How do I understand how firm the memory foam mattress will feel?

The best way to understand this is to go by the manufacturers rating. For example, the Ergo Flex™ memory foam mattress is rated as medium / firm.

However the difficulty with this is that no independent firmness tests or guides currently exist in the UK for manufacturers to adhere to and benchmark their mattress against others. This makes it difficult to understand comparisons between different memory foam manufacturers products. How soft or firm the foam feels to each of us is a very subjective matter. Each of us has different comfort preferences, which makes this interpretation or rating guide difficult to use in isolation. This is why we also recommend you understand the 'ILD' rating of the mattress to gauge its firmness. The ILD rating of a mattress is explained below.