Glennis was the woman featured in the Gainsborough Studios' opening logo.
Studied for two years at a dramatic school, two years of dancing and two years film extra work before she became one of the Gaumont-British "Baby Stars".
Educated at the Regent Street Polytechnic.
She impersonated Sarah Siddons of Thomas Gainsborough's portrait for the Gainsborough Pictures trademark. Her Step-father, Henry Ostrer, was a Director of the Company.