I've used this charity before to donate furniture to on behalf of my boss, who was clearing out several large items to make way for the latest models! Emmaus were very grateful. They are a charity who do work with the Homeless. They have projects all over the country and provide work for homeless people renovating furniture that has been donated in their workshops. A more worthy charity for your sofa bed I cannot think of.

Here's the link to the information page on donating furniture on their website.

http://www.emmaus.org.uk/66/donate-furniture


I'm certain they will make very good use of your sofa bed.