Supportive double mattress (SM4)

Hi everyone, I am on the lookout for a hard/supportive double mattress for my father who has Parkinsons, if anyone has one they no longer need? We recently got him one but it’s too soft and he has trouble turning over at night in it (it’s memory foam!).
We live in Morden and can collect most evenings and sundays anytime. I would be so grateful.
Many thanks, Alison

       
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