Harrogate was a town in in Yorkshire, England.
On 18 December 1926, the Tenth Doctor and Donna Noble took Agatha Christie to a hotel in Harrogate so she could recover from her encounter with the Vespiform. She woke up there with no memory of what had happened to her. (TV: The Unicorn and the Wasp)
According to one account, Sarah Jane's mother was from Harrogate. (PROSE: Island of Death)
At some point in the 1970s, the British government relocated to Harrogate when dinosaurs began appearing in London. (TV: Invasion of the Dinosaurs)