BEAT is the UK's leading eating disorder charity. They have a huge amount of resources and forums where you can seek information and support for yourself or for someone you are concerned about. Do look them up.
The National Autistic Society is a community for autistic people and their families. It has loads of resources, and a community where you can learn and feel connected.
The Autistic Girls Network is a charity that exisits to support, educate and bring about change. This has a particular focus on being autistic as a female. This is a hugely important, under-researched, misunderstood area. They are pioneering excellent resources and community here. Do take a look.
This is a pathway focussing on the overlap between eating disorders and autism, and drawing together research and resources from clinical practice. A really important new field, when at leadt 35% (or more) people with eating disorders are also autistic.
If you prefer to learn by listening or watching, this might be a more suitable format for you. A podcast that interviews many different professionals and people who are experienced in the field of ADHD and Autism, or who share their own lived experiences. Lots to browse through.
Supporting the wellbeing of neurodivergent kids and adults through fitness. Based in Guildford, Surrey. This local organisation is run by Dan Jenney, a passionate ADHDer, who really gets it, and hugely values each individual and family. If your young person is perhaps home schooling, or struggling to access fitness in school, then go and check them out.