Chester was a city in England.
Abby travelled forward in time to discover what had happened to the population of Compton, and discovered that a memorial service for the people of Compton had been held in Chester. (AUDIO: The Fog [+]Simon Guerrier, Graceless (Big Finish Productions, 2010).)
Nina Rogers was born in Chester in 1988, and lived there until 2006. (PROSE: Consequences [+]Error: Code 2 - no data stored in variables, cache or SMW.)
The Ninth Doctor once visited Chester Zoo. (PROSE: Have You Seen This Man? [+]various authors, Who is Doctor Who? (BBC, 2005).)
In 2005, following the Dummy Massacre, Steve Woolfall responded to Doctor Who?'s request for sightings of the then missing Rose Tyler, reporting that he had seen a girl that looked like Rose in the Grosvenor Museum in Chester that afternoon with a chap that reminded him of "that Casanova bloke". Steve suggested that it might not have been the same girl but that it was strange nonetheless. (PROSE: The Doctor Was Involved in the Dummy Massacre [+]BBC webteam, Who is Doctor Who? (BBC, 2005).)