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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).
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.