The NHS Website provides a comprehensive list of websites and helplines to support people with a range of psychological health concerns:
https://www.nhs.uk/conditions/stress-anxiety-depression/mental-health-helplines/
as well as suicidal thoughts:
https://www.nhs.uk/conditions/suicide/
Samaritans: call free on 116 123 (UK and Ireland)
Education support: is a helpline for UK teachers, lecturers and staff in education: call free on 08000 562 561
Support for children and young people:
ChildLine: call free on 0800 11 11 (UK); 1800 66 66 66 (Republic of Ireland, under 18s only); 01 6767960 (Republic of Ireland, for parents); webchat available (check website)
Youngminds Crisis Messenger: text YM to 85258 – texts are free from some service providers