Many charity shops have collection boxes for foreign coins, used stamps and stamp collections. Check with your local shop. See CHARITY SHOPS, check the Edinburgh Charity Shop and Reuse Map on the Changeworks website
Funds are raised from selling them to collectors and dealers.
Edinburgh Airport has a collection box for foreign coins in the International Departure Lounge and this is also available on return flights from international destinations. Proceeds are donated to charity. Similar schemes are available at most travel agencies and foreign exchange desks.
Stamps (and postcards) can be posted to:
Hearing Dogs for Deaf People
c/o Mrs A. Bernard
Stamps and coins can be posted to:
St. Columba's Hospice
15 Boswall Road