Glanville became involved in the film industry in war service at Elstree Studios and studied art during her free time.

After the Second World War she joined a puppet theatre company with which her parents were connected, Ebor Marionettes.

[1] Glanville joined AP Films in 1957 and worked on all its series, as well as the later Supermarionation presentations of Anderson's Century 21 Productions.

[citation needed] The likeness of Mrs Appleby, a supporting character that appeared in The Secret Service (1969), was based on Glanville's mother.

One of her 3rd great-grandparents was Domenico Corri (1746–1825), an Italian musician and publisher who, in the late 18th century, moved from Rome to Edinburgh to teach music.