In his book, An Englishman in Auschwitz, Mr Greenman described their arrival in Birkenau.

"The women were separated from the men: Else and Barny were marched about 20 yards away to a queue of women...I tried to watch Else. I could see her clearly against the blue lights. She could see me too for she threw me a kiss and held up our child for me to see. What was going through her mind I will never know. Perhaps she was pleased that the journey had come to an end."

Mr Greenman later said that the hope of being reunited with Else and Barney kept him going in the gruelling days ahead.

After learning his wife and son had been gassed, Mr Greenman dedicated his life to educating people about the holocaust and fighting racism.

He never remarried, grieving for his lost family all his life, and spent his last years living at his home in Ilford, east London.