I'm running Race to the King in June 2016 an 84km Ultra-Marathon, as a vegan - to raise money for DHT and show that you don't need animal products to thrive at tests of physical and mental endurance. 

The Dr Hadwen Trust (DHT) is the UK’s leading non-animal medical research charity. They fund and promote the development of techniques and procedures to replace the use of animals in biomedical research.
http://www.drhadwentrust.org/about-us/who-we-are

Donating through JustGiving is simple, fast and totally secure. Your details are safe with JustGiving – they’ll never sell them on or send unwanted emails. Once you donate, they’ll send your money directly to the charity. So it’s the most efficient way to donate – saving time and cutting costs for the charity.