easy fundraisers

Used stamps for charity- do you know of any charities currently asking for used stamps?

Can anyone tell me of any charities in the UK (preferably in Northern Ireland) who are asking for used stamps.

We get about 5000 letters into the office every week and it would be good to do something worthwhile with the stamps!

What do charities get out of used stamps ?

Charities ask for used stamps , but what do they get out of them?

Do you know any Major Charities in the UK who collect postage stamps?

A former acquantaince of mine used to collect stamps for charity but since his death, I am left with people still donating stamps within my organisation but my having no charitable outlet for them. Does anyone have any useful suggestions of any appropriate UK charities?