How do I donate?
You can always donate to this excellent cause without taking part in the challenge directly.
Simply click the donate button on this page, and you will be taken to the PayPal donations page. Fill in the amount you wish to donate, and click "Next".
Don't forget, thanks to our partners the Bill and Melinda Gates Foundation, every £1 you donate is matched 2-to-1 (so is worth £3!).