Make-A-Wish UK

" Right now, around 63,000 children in the UK are eligible for a wish because they have a life-limiting or life-threatening condition. From the moment they are diagnosed, the simple pleasures of childhood and family life are replaced by worry, disruption, medical appointments, financial worries and isolation.

Make-A-Wish exists to put those issues to one side by empowering a child with the chance to choose a wish that's unique to them, when so much else has been decided for them because of their health needs. In doing so, a wish creates hope, happiness and memories for the whole family to cherish."

https://www.make-a-wish.org.uk/about-us/what-we-do/