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Cannot help much. Last time I owned a firm mattress from new I bought it from the bed shop on East St off Walworth road, had about a year before moving out of that flat but it was incredibly firm and comfortable for a ‘cheap’ mattress. I miss it.
I now sleep on a futon marketed for westerners (Futon Shop), and it can’t get any softer, it’s a futon. Probably not what you’re after, but I love it. I have no qualms.
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We have this (from 6 years ago) https://www.johnlewis.com/john-lewis-partners-natural-collection-hemp-4000-comfort-support-king-size-firm-tension-pocket-spring-mattress/p3659608. It is not quite as firm as on day one, but still a delight to return to after a trip away.
Would recommend trying them (when not sleepy), with the advice that test mattresses in shops are likely as soft as they will ever be (due to people bouncing around on them lots).
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I have an Otty which is still firm after a couple of years. Kept its firmness better than the (admittedly cheaper) IKEA mattresses that I'd previously had. It seems to be the firmest of those new mattress companies.
If you're not fussy it's worth keeping an eye on their eBay stores. They have refurbs (returned and deep steam cleaned) for about half price (and often another discount when eBay do discounts).
Oh great cloud mind, please recommend a mattress that you've owned for years and still like to sleep on.
Requirements: Firm, won't soften up so much that you feel like you're sleeping on Mark Francois' brain.
Any love for IKEA? Our last one cost a fortune, price does not predict durability it seems. Our current one has gone from firm to medium in 2.5 years.