Diane Holmes

Diane Holmes was a pilot who flew into the Cardiff Rift. She was the lover of a married man prior to going through the Rift.

On 18 December 1953, she, John Ellis and Emma-Louise Cowell were on their way to Dublin in Diane's plane, the Sky Gypsy, when it flew through the Cardiff Rift and ended up in Cardiff more than 50 years later.

Diane and Owen Harper had a relationship, but she decided to fly away and try to find the Rift again, hoping to get back to 1953. (TV: Out of Time)

Owen activated Torchwood Three's rift manipulator with the intent of forcing the Cardiff Rift back open, hoping to find Diane again. (TV: Captain Jack Harkness)

Later, an apparition claiming to be Diane appeared to Owen after he opened the Rift. This was later revealed to have been a vision caused by Bilis Manger. (TV: End of Days)

Torchwood website
The series 1 version of the Torchwood website contained a number of documents and articles pertaining to Diane Holmes.

Plucky gal flies in from London solo!
A newspaper article titled "Plucky gal flies in from London solo!" reported on Diane's flight from London to Sydney. The article compared Diane to Amelia Earheart, stating that she spent four days without stopping to refuel or sleep. When asked by the reporter how she found the experience, Diane replied: "Terrible wind across Bengal Bay". She planned to do a little sight-seeing, including flying out to Ayers Rock, before making her return journey.