An early task was working on the French Vautour aircraft fitting the AD2300 Doppler airborne navigation sensor. He was closely involved with this system taking part in compatibility trials in a Viking aircraft in 1960. Later, based in France, he oversaw the fitting of that system with its computer to the Mirage as part of the French “Force de Frappe” nuclear strike force of the early 60’s.
He also took part in a sales promotion tour in Europe to demonstrate the performance of the system.
In the late 80’s Denys was based in Kuala Lumpur with his wife Mary. There he represented both Basildon and Rochester interests.
Denys lived in a cottage at Heybridge Basin, having a keen interest in things nautical. He was strongly opposed to any development that spoilt the nature of Heybridge. His daughter, Susan, shared Denys’s interest and became skipper of a Thames Barge.
Denys died on the 9th January aged 91. The Service of Thanksgiving held on the first of February at St Georges Heybridge was attended by many of his Marconi colleagues.