If you are a UK taxpayer, tick the Gift Aid box and increase the value of your donation by 25p for every £1 you give, at no extra cost to you.
"I want to Gift Aid my donation and any donations I make in the future or have made in the past four years.
I am a UK taxpayer and understand that if I pay less Income Tax and/or Capital Gains Tax than the amount of Gift Aid claimed on all my donations in that tax year it is my responsibility to pay any difference."