Kammala jumla mai zuwa: Bayan samar da gajeren lokaci a cikin 'yan wasan yanki na Scarlets yayin da Mark Jones ya tafi taimaka wa ƙungiyar Wales ta Wales a lokacin gasar cin kofin duniya ta 2002.
2013 gasar Six Nations, Holley ya shiga Bristol Rugby a matsayin kocin kungiyar farko kafin kakar 2013 <unk> 14. Ya sabunta kwantiraginsa tare da Bristol a watan Afrilun 2015. Bristol ya sami ci gaba zuwa Premier Ingila a karkashin jagorancin Holley a karshen kakar 2015/16 inda ya doke Doncaster a wasan karshe na uku a cikin shekaru masu yawa. A ranar 24 ga Yuni 2016, shi da Bristol Rugby sun rabu da juna ta hanyar yarjejeniya.