Foam/Camper mattress (Oakdale, Poole BH15)

Used camper mattress, it has a dip that partner finds uncomfortable if used for more than a few days. Cover has historic water stains (the roof leaked, years ago). Could be used as a mattress or stripped and foam repurposed. 710mm (28")wide, 1890mm (74½") long, 150mm (6") thick.