Vienna-born Margit Cohen, 90, has not previously spoken to anyone beyond her family about her experiences as an only child who left her parents to board a Kindertransport to England in December 1938. Her father and most of his seven siblings were murdered in Nazi camps — Mrs Cohen never discovered her mother’s fate.

Students who joined Nick Clegg on an Auschwitz visit met the Liberal leader and deputy PM once again as they witnessed his signing of the Holocaust Educational Trust’s Book of Commitment against prejudice and racism.

Hungarian-born Professor Ladislaus Lob and his father were in Bergen-Belsen under comparatively privileged conditions. They were among 1,700 Jews who survived through a financial agreement negotiated by Rezso Kasztner with Adolf Eichmann, adminstrator of the Final Solution. Mr Kasztner’s actions were the subject of great post-war controversy in Israel.