Large piece of foam from fold up mattress (March PE15)

This piece of foam was the bottom piece of a three part single fold up mattress chair. I am not sure of the fire label status as the cover was disposed of ages ago and this bit of foam was put in the loft in case it could be reused. As we will soon be moving house and I would like to rehome it. The size is 14cm (5.5") x 61cm (24") x 73cm (29") approx.