IKEA Morgedal foam mattress (no springs). Firm.
Standard doulbe (140cm x 200cm). Thickness: 17cm.
The mattress is 10 years old, but in very good condition (no dipping in the middle; it has always been used with a mattress protector). (I know it looks a bit wonky on the photos from its side, but it's only because it's stood against the wall). I'm giving it away because it was the wrong size for a new bed.
It is in Newhaven on a 3rd floor. I can help you take it down the stairs, but, unfortunately, I don't have a way to help you transport it.

Mattress (Newhaven EH6)