Autism friendly hairdressers in London

Hi all,

I hope this is an appropriate place to post this question! I am trying to find an autism friendly hairdresser for my brother, who is 29 and non-verbal. He has been going to the same hairdresser for many years, but now that he is an adult and big and loud, they are getting impatient with him. I've been searching online and have found some good resources for children but nothing for adults. If there is anyone who has any advice I'd really appreciate it. Many thanks!