Carnaby Street was a London location famous for its fashion.
Melanie Bush told the Sixth Doctor that when he mentioned the 1960s, she thought of Carnaby Street and hoped they'd go somewhere fabulous and groovy, but they had instead ended up in Salford. (AUDIO: The Vanity Box)
Ace's Aunt Rosemary frequently talked about her youth in the 1960s, including Carnaby Street. (PROSE: The Greatest Show in the Galaxy)
Carnaby Girl and Irvine Sellars were located beside each other on Carnaby Street in the 1960s. According to Alistair Gordon Lethbridge-Stewart, the street was a famous hot spot for young people, often with boys wearing bell-bottoms and double-breasted jackets, while girls wore mini-skirts and go-go boots. (PROSE: The Forgotten Son)
When Polly emerged from what was likely her first trip into the TARDIS wardrobe, she was impressed by the First Doctor's selection of clothes, and wondered if he had "gone shopping on Carnaby Street". (TV: The Tenth Planet)
History
Amy Pond and Rory Williams waited for the Eleventh Doctor on Carnaby Street during the winter of 1962. Amy complained that the inside of his bus was colder than standing outside and the Doctor dismissed her complaint by stating, "It's the weekend, it's this time of year, you know how it is." (COMIC: Bus Replacement TARDIS)
In James Stevens' article on C-Day, he wrote that Carnaby Street was one of the places for fashion during the summer of 1966. (PROSE: Who Killed Kennedy)
In 1974, the Tenth Doctor and Martha Jones visited Carnaby Street and shopped at Bus Stop. (COMIC: Agent Provocateur)
In 1994, Polly Wright visited the street and found that it had completely changed since the 1960s. (PROSE: Invasion of the Cat-People)