Where to buy an extra firm double mattress?

Posted by wilstouff@reddit | AskUK | View on Reddit | 7 comments

Just recently moved into a new flat which came furnished, but the mattress is simply too soft and saggy for me. I prefer extra firm so I'm thinking of just buying a new mattress and plopping it on top of the existing mattress.

I've got my eye on this Super Firm Foam Mattress. Wondering if anyone has feedback on this specific model or has a suggestion on something similar that won't break the bank (say under £500 for a double)?I'm used to sleeping on this Asian brand called Sea Horse Healthy Mattress which is pretty much rock hard so anything with a similar level of firmness would be good.