She is most famous for having played Veruca Salt in the first Willy Wonka movie, when she was 12 or 13. (She was 19 in the clip above.)
Here is the story behind that scene, in which a pervy reverend was secretly watching her undress. There was another sexy scene involving the same two characters, but it never aired.
The actor playing Pervy Vicar explained:
“We’d already caused controversy in a scene where I watched Rowella undressing through a crack in the wall. Then I had to make love to her feet. Julie spent the whole week getting pedicures. On the day of the shoot at Pebble Mill, she washed her feet several times and was carried from her dressing room to the bed on the set. The scene was a close-up of her foot and my tongue. It was a riot. When the head of the BBC saw it, he said: ‘There’s no way I can put that scene out on a Sunday night after Dad’s Army!’ So it was never shown."