Our bed is made of two old single bed frames put together with chipboard (or something similar) as the base. We have previously used two single mattresses (90cm x 190cm) and then bought a fairly cheap reflex foam mattress (c. 180cm x 195cm), which has been disappointing. We think it is time to rethink and possibly spend a bit more. My husband especially likes a firm surface for sleeping, which I also don't mind. He is also a big fan of foam mattress - I'm not exactly sure why! We are both about 1.78m tall and weigh between 11 and 12 stone. Would you have any advice on what to look at?