Giles was a technology expert at P.R.o.B.e., joining at some point before 2014. He was second-in-command of the organisation, being told that he would become the boss if anything happened to Liz Shaw. (HOMEVID: When to Die) Later, he would take over the position.
In 2014, Giles found Box in P.R.o.B.e.'s storage hold and managed to repair it. He disapproved of Liz when she took on the Paul Reynish job due to the substantial workload they already had. Although he wanted to go with her on her mission, Liz told him to stay to lead P.R.o.B.e. if she did not return. (HOMEVID: When to Die)
At least five years later, Giles was director of P.R.o.B.e. and had to prepare for perihelion. (WC: Shadows of Doubt) He had a team that consisted of Agamya, Bedevere, Maxie, and Tasha. (PROSE: The Door We Forgot)