The Samaritans
Charity service, helping people in times of need.  24 hours a day, 365 days a year.

https://www.samaritans.org/

ChildLine
ChildLine 0800 1111: get help and advice about a wide range of issues, talk to a counsellor online, send ChildLine an email or post on the message boards.

https://www.childline.org.uk/