Sheffield

Sheffield was a city in Yorkshire, England.

In 1979, Ian Dury and the Blockheads performed in concert in Sheffield. The Tenth Doctor attempted to take Rose Tyler to this concert but they ended up in 1879 Scotland. (TV: Tooth and Claw)

In 2001, Dr. Who assassinated Queen Elizabeth II while she was making an appearance in Sheffield. The self-doubts of his accomplice Jason, coupled with his own essentially fictional nature, meant that the Queen survived. (PROSE: Head Games)

Harwood's Haulage, Rhys Jones' employer, operated out of Sheffield, Ipswich, Carlisle and Cardiff. (TV: Kiss Kiss, Bang Bang)

In 200,100, the Grand Central Ravine was named after Sheffield, which was then described as an "ancient British city". (TV: Bad Wolf)

Behind the scenes
The website whoisdoctorwho.co.uk had a list of sightings of the Doctor from which people had ostensibly been submitting to Clive, a conspiracy theorist character from Rose, who had pictures of the Doctor's ninth incarnation on the website, asking if anyone had seen him.

A submission from H.J. Hardeman claimed to have seen "someone very much like him about a year ago". He had tried swapping "Edwardean gear" [sic] at an Oxfam in Sheffield for a pair of jeans and trainers.