From site:
Now there's no need to worry about how you're going to get rid of your old mattress. Sleepy's will take it away - free!
We are regulary contacted by organisations and charities that can put your old mattress to very good use and we see it as part of our corporate responsibility to be able to in some way recycle your old mattress in this way.
Obviously any heavily soiled mattresses or mattresses with excessive wear and tear are not passed on to these organisations and are disposed of in an environmentally manner."
I believe you would have to buy a new bed to use this.