When John Joseph McEnhill was born on 26 April 1920 in Newmains, Lanarkshire, his father, John, was 25 and his mother, Grace, was 17. He had two sons and two daughters.

Known as “Jack”, he was a nuclear physicist working at Aldermaston. He went to Woomera and Bikini to witness the atomic tests there. Frances Adrienne McEnhill recalls him delivering a lecture at Glasgow University. He died on 15 July 1986 in Wokingham, Berkshire, at the age of 66.