One Rule (audio story)

 was the fourth audio story in the first season of the Big Finish Torchwood series. It featured Yvonne Hartman for the first time in any medium since her television debut.

Publisher's summary
It's been three weeks since the Mayor of Cardiff was killed by a shop dummy and the fight is on to see who will replace him.

Yvonne Hartman is visiting the city to retrieve an invaluable alien device. She's in charge of Torchwood One, she's saving the British Empire and she doesn't care about local politics. But she is going to find herself caught up in that fight. There’s a bloodthirsty alien stalking the streets and there’s a special offer on at the all-you-can-eat Chinese buffet.

It’s the 26th of March 2005 and it’s the day that everything changes.

Plot
to be added

Cast

 * Yvonne Hartman - Tracy-Ann Oberman
 * Barry Jackson - Gareth Armstrong
 * Helen Evans - Rebecca Lacey
 * Ross Bevan - Dan Starkey
 * Meredith Bevan - Catrin Stewart
 * Gwen Cooper - Eve Myles (uncredited)
 * Andy Davidson - Tom Price (uncredited)

Continuity

 * The Mayor of Cardiff was killed by the Auton invasion which reached Cardiff on 5 March 2005. (TV: Rose) He would eventually be succeeded by Blon Fel-Fotch Passameer-Day Slitheen, posing as Margaret Blaine. (TV: Boom Town)
 * A cover story was concocted to explain away the invasion on 5 March as a 'terrorist attack'. Such measures were previously taken for the first Auton invasion in the 1970s. (PROSE: Who Killed Kennedy, TV: Spearhead from Space)
 * Gwen Cooper and Andy Davidson are members of the Cardiff police force. (TV: Everything Changes)
 * Helen Evans was born and raised in Splott. (TV: Ghost Machine, Random Shoes et al)
 * Both Helen Evans and Barry Jackson, who are running in the mayoral race, moan about London's lack of interest in their city. This is reminiscent of when Blon went "native" during her time as Lord Mayor. (TV: Boom Town)
 * Yvonne explains to Helen and Barry that Torchwood's presence in Cardiff is down to the space-time rift running through the city. (TV: The Unquiet Dead, Everything Changes) Yvonne states that alien objects and species come through the rift and that Torchwood seizes them and uses them to defend Britain. (TV: Army of Ghosts)
 * Whilst talking to Ianto on the phone, Yvonne tells him to ask Lisa Hallett out. (TV: Cyberwoman)
 * Ianto manages to hack into a London Credit Bank ATM. (TV: The Runaway Bride)
 * Torchwood One are attempting to ascertain the nature and purpose of the Void Ship. (TV: Army of Ghosts / Doomsday)
 * Torchwood Three possesses a Drahvin scanner, which is procured by Yvonne. (TV: Galaxy 4)
 * Yvonne speaks of the incident on New Year's Eve 1999 involving the murder of the Torchwood Three team by Alex Hopkins, who went mad after seeing the coming "change" in the 21st century before committing suicide. (TV: Fragments)
 * Yvonne says that she is doing it "for Queen and Country" before downing a glass of white wine. She would maintain that she did her duty for Queen and Country immediately before her forced cyber-conversion. (TV: Doomsday)
 * Barry Jackson is an enabler of the Committee. (AUDIO: The Conspiracy)