Perfect is an agent with British Intelligence.
The period of time for her activities is the mid-60's. The exact year is not mentioned so for this purpose let's settle on 1966. That would make Perfect 24 years old since she was born in Gloucester in 1942.
Perfect is a definitely a child of the 60s, being the - um - perfect age for dressing in mod clothes of bright, often clashing colors, shin-high tall-heeled boots, and a floppy beret-ish hat covering dark shag-cut hair. Some might describe her as impish at times while others get a lot closer to the true with comments like her narrator who said she was a combination of Emma Peel sexiness and Inspector Clouseau clumsiness.
Thanks to that narrator, we learn that when she had a bit of a troubled educational history - expelled from several different schools over the years: from Grammar school for wilful myopia from one and wilful hyperopia from another (what?), from Mrs. Boggs' High School for Awkward Girls for being, well, awkward. At the age of 18 she tried to join the W.R.A.F. but was rejected for bad eyesight (kinda proven when she mistakenly got herself locked in a broom closet. She then turned to the Wrens but they had already heard about her so was not accepted. Needing a job, she went into retail as a clerk.
When she was 23, she was at a major department store in London when she chased down a suspected shoplifter and ended up tackling a British Intelligence traitor with vital secrets on him. "Suspected of complicity, taken in for interrogation, but after hours of questions, they let her go on the condition that she stop asking questions." This was followed by something wonderfully typical of Perfect: "Inducted for training for the Women's Intelligence division of MI6. had no idea what was going on. Thought she's been sent to prison. Baffled at being given a car, a gun, a lovely flat, and not being told off."