Hey Huggy Bear
Here's a list of some recycling charities, some are based in the UK:http://www.runtheplanet.com/shoes/selection/recycle.asp
There is also africarun.org, based in France:
Africa Run, 42 Rue Emile Leblond, 92500 Rueil Maimaison, France
If you can afford it, you can air mail your shoes to:
c/o Monicah Kiplagat
PO Box 6943
Ironman SA also has bins at the race for those people who want to donate tri equipment.