From 1964 Griffiths was the official secretary of the octet .
In 1957 it was secretary 's ' membership of that group that led secretary 's Griffiths ' his involvement in TV 's Land of Song .
From 1964 Griffiths was the official secretary of the octet , but in 1957 it was his membership of that group that led directly to his involvement in TV 's Land of Song .