Here's a few sites offering free prints at the moment. I think most of them just require that you pay p+p. I've listed those offering the most prints first, I think.
http://www.byphotos.co.uk
http://www.digital-lab.co.uk
http://www.mypixmania.com
http://www.truprint.co.uk
http://download.pixology.com/jessops/index.htm
http://www.pixum.co.uk
http://www.ofoto.co.uk
http://www.fotoinside.co.uk
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