A man caught up in the 7/7 terror attacks searches for the stranger who held his hand, and a woman whose family fled war-torn Bosnia looks for the doctor who helped them escape.

An activist diagnosed with HIV in the 1980s searches for the therapist who gave him hope for the future, and a man shot during the Troubles looks for the nurse who was his ‘angel'.

A Falklands naval veteran tracks down survivors from his squadron, and a migrant to 60s Britain searches for the teachers who helped him overcome childhood racism and xenophobia.

Twin brothers who fled Nazi Germany search for the family who helped them escape, and a woman who housed 21 child refugees from Bosnia looks for their mystery schoolgirl translator.