The Chairman’s Charity now has a Just Giving page if you wish to donate to it.
Juvenile Diabetes Research Foundation (JDRF) is a research charity trying to find a cure for Childhood Diabetes. https://jdrf.org.uk/
They fund research to cure, treat and prevent type 1 diabetes. They work with government, academia and industry to accelerate research and healthcare policy in the UK. And they give support and a voice to people with type 1 and their families.