There are many ways to recycle items instead of them going to landfill. This guide on the Money Saving Experts web site has useful tips on the best way to use these sites and avoid spam.
Don't let Devon go to Waste campaign which has contributed to Devon achieving a 55% recycling rate and significant reductions in the amount of waste sent to landfill.
UK based Freecyle site
Site for free classifieds ads in the UK
Computer Aid International is a UK-registered ICT for development charity which collects IT equipment