Rubuta ci gaba ga wannan sakin layi - Hadden ya maye gurbin Matt Williams kuma an nada shi a ranar 15 ga Satumba 2005. Hadden ya horar da makarantar Merchiston Castle 1st XV bayan an nada shi Shugaban Ilimin Jiki a makarantar a shekarar 1983. Ya horar da kungiyoyin shekaru daban-daban na Scotland kafin a nada shi mataimakin kocin Caledonian Reds a shekarar 1997. Daga baya aka nada shi kocin Edinburgh Gunners (yanzu Edinburgh Rugby) a 2000 kafin ya zama kocin Scotland. Tun daga wannan lokacin ya horar da Scotland zuwa gagarumar nasara a kan Ingila da Faransa a gasar zakarun Turai ta 2006.
da kuma sake lashe gasar Calcutta Cup da Ingila a 2008 Six Nations. Ya rabu da kamfanin tare da ƙungiyar ƙasa a ranar 2 ga Afrilu 2009 bayan na biyu a jere mai ban takaici Six Nations inda suka gama na biyu a ƙasa bayan sun ci wasa ɗaya kawai.