Mine All Mine - Yanto Jones
Here is where Ianto Jones came to exist. Originally (in Torchwood) Ianto Jones was going to go by the name of Idris Hopper (who many speculate was the same character as seen in Doctor Who: Boom Town such as Tosh had been seen in Aliens Of London.) Gareth David Lloyd had previously played a character named Yanto Jones on Russell T Davies’s ‘Mine All Mine’. Once GDL was cast, the character’s name was changed from Idris Hopper to Ianto Jones. Idris later makes an appearance in the Torchwood Novel: Twilight Streets.
Regardless: Look at how adorable Gareth is. (He appears at 2:08)