Can usually be sold to scrap metal merchants. You can also take it to your local Household Waste Recycling Centre.
Sewing machines and Sewing Accessories (scissors, tape measures, needles, thread etc)
Some are all accepted by Tools for Self Reliance. Further details are provided on their website.
Most opticians will accept old spectacles for repair and shipment to Third World countries.
Many charities benefit from the donation of stamps, contact your favourite charity to see if they can benefit from reusing them. Age UK will accept old stamps.