His sons Charles and Alex , who had joined the agency in 1972 and 1976 respectively , continued the business .
Armitage died of a heart attack at his home in Stebbing in 1986 .
Armitage 's sons Charles and Alex , who had joined the agency in 1972 and 1976 respectively , continued the business .
Armitage died of a heart attack at his home in Stebbing in 1986 .