He was the son of Sir Richard Glyn, 8th Baronet, and his wife Edith Hamilton-Gordon, the great-granddaughter of the Prime Minister Lord Aberdeen.
Two years later he published what became a standard reference work, "Bull Terriers and How to Breed Them", which he had started to research while at Oxford.
While still a new MP he was chosen to second the 'Loyal Address' after the Queen's Speech, and he was appointed as Parliamentary Private Secretary to Sir David Eccles.
Glyn's interest in livestock had continued and he was made Chairman of Crufts, a position he held for ten years.
After stepping down from Parliament at the 1970 general election, he devoted more time to his hobby and was Chairman of the Kennel Club in 1973.