Conversation so far:
where was Glenda Jackson born?
Jackson was born in Birkenhead on the Wirral.
where did she attend school?
Jackson was educated at the West Kirby County Grammar School for Girls, and performed at the Townswomen's Guild drama group during her teens.
who were her parents?
where her father was a builder, and her mother worked in shops and as a cleaner.
when did she begin her acting career?
Jackson made her professional stage debut in Terence Rattigan's Separate Tables in 1957 while at RADA.

Question: what was her first film?
Self-contained rewrite: what was Jackson's first film?