Glynis Johns really has had an incredibly prolific, diverse career that (remarkably) stretches back to the 1930's. Besides the films you mentioned, some of my favorites are State Secret, No Highway in the Sky, The Court Jester, Shake Hands with the Devil, While You Were Sleeping, but many, many others also.
She was quite lovely and funny with that unique speaking voice immediately identifiable in a great cast including Michael Wilding, Paulette Goddard, Diana Wynyard, C. Aubrey Smith and Hugh Williams. The Cecil Beaton costumes are quite sumptuous in the beautiful Technicolor, and it's an enjoyable version of Oscar Wilde's play.
