CLIC Sargent is the UK's leading children's cancer charity, their website is a good place to start looking for information and support.
Macmillan Youth Line -0808 808 0800 - is for people between 12 and 21 years old who have any questions or concerns about cancer. (9am–10pm, Monday–Friday).
These websites are for young cancer patients. They provide high-quality information and on-line forums:
Clicsargent cancer charity provides a number of titles which can be ordered free of charge, and some can be viewed on-line.
Wessex Cancer Trust: 'We can make it' - a booklet for teenagers who are about to undergo treatment for cancer.