Born in Islington to Ernest Kerridge and Antoinette Fick, she attended Highbury Hill School from 1924 to 1928.

Her family later moved to Esher, Surrey and she attended Wimbledon High School from January 1929 to July 1932, having taken her London University Higher Certificate in English, French, Modern History and German in June 1932.

[4] Beginning her career in the repertory companies of Margate, Southsea and Bath, Kerridge made her West End debut in 1937 with Edgar Wallace's The Squeaker.

She then based herself in Windsor, running the Theatre Royal and its in-house repertory company, whilst also directing and performing.

After the war she appeared in a number of West End productions under her husband's direction, amongst them Tyrone Guthrie's only play as a writer (Top Of The Ladder at the St James' theatre in 1950).