The film was the United Kingdom's first animated film.
The cause of death wasn't known, although her daughter Steffanie Pitt said her mother had recently been in poor health.
She returned to Doctor Who as Dr Solow in Warriors of the Deep, which was the first serial of the 21st season of the show in 1984.
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These portrait photographs of Russia's ruling Romanovs were taken in 1903 at the Winter Palace in majestic.
During the 1980s, Pitt returned to mainstream films and television.