Holocaust survivors were invited to a Buckingham Palace garden party in recognition of their contribution to Shoah education.
Two of the group, Cirla Lewis and Susan Pollack, met the Queen.
Ms Lewis, a "hidden child", said it had been "an honour to tell her about my story. What a marvellous country we live in."
Ms Pollack, an Auschwitz survivor, said the Queen had shown "understanding and empathy" towards her. "The beauty of the house and gardens was amazing."