Old cot mattress (Malvern Link WR14)

I wouldn't recommend using it as a cot mattress as it is very old so unlikely to comply with current safety standards, but as a toddler "sofa" or a crawling baby "obstacle course" or crash-mat kind of thing, it could be useful. It's a wipe-clean plasticcy surface. It's in really good condition so would be a shame to chuck it. I've put a photo of it on a 2-seater sofa for indication of size. It could actually go under the cushions to raise the sitting height - just another suggestion. Anyone got a use for it? Size approx 105cm x 53cm x 13cm