He signed the Roll of Distinguished Philatelists in 1993 and lived in Wembley, London.
Whilst in Ostrava, Hornung witnessed the German invasion of Czechoslovakia in March 1939 but managed to escape to Bogumin, then in unoccupied Poland, dressed as a postman in the mail wagon of a goods train.
Hornung was a former Secretary of the Philatelic Traders Society and organiser of the Stampex show.
[1] He was also a founder member of the Association Internationale des Journalistes Philateliques (AIJP) in 1952 and its former President.
[1] As a philatelist, Hornung specialised in the stamps and postal history of Turkey and won Large Gold medals at India 1989, New Zealand 1990, London 1990, Philatokyo 1991 and Granada 1992.