There's a fabulously simple box you can tick when you list items that allows you to give a proportion of your takings to charity.
From the options available, I decided to go for Great Ormond Street Hospital for three reasons; 1. Their acronym is GOSH, 2. I've heard the name thousands of times but am not really certain of what they do. 3. As a teenager, I was a Spurs fan as is Lord Sirallun who does their adverts. (I know you can't say "I used to be a fan" as being a fan implies life-long fidelity, but I have completely gone off football and would say, you can get divorced but you can't get remarried.
We raise money to enable Great Ormond Street Hospital to provide world-class care for its young patients and their families and to pioneer new treatments and cures for childhood illness by:
Contributing to the rebuilding and refurbishment of the hospital;
Funding the most up-to-date equipment;
Supporting research into, and development of, breakthrough treatments; and
Providing accommodation and other support services for children and their families