Hello Karesz, very many thanks for your reply. It does seem like this is going to be tricky. But that doesn't put me off! Perhaps it would be easier for me to focus on the Israeli end of the story. If anyone is reading this who knows about Israeli records, this cousin lived in Be'er Sheva, any ideas about how I can investigate residents there in the late 1950s? 
Karesz, I may come back to you later if I don't get anywhere. Many thanks again.
Emma Cole