Ka tīmata ia i ana akoranga mātauranga teitei i te United Kingdom, i reira ia i ako ai i University College, Durham me Brunel University, i Ingarangi. I te tau 2006 i uru ia ki Institut Philanthropos i Fribourg, Switzerland, i reira i noho ai ia i te tau e ako ana i te whakaaro me te tikanga tangata. I muri mai ka ako ia i nga reta me te pūtaiao tōrangapū i te Institut Albert-le-Grand i Angers, ka whiwhi i tana tohu paetahi me te honore i te tau 2009. I tukuna tana tohu paetahi e Université d'Angers, na te whakaaetanga hononga i waenga i nga kura e rua. Pātai: he aha te mea kei roto i te maatauranga hoia a Guilaume?
Royal Military Academy Sandhurst (Te Whare Wānanga o te Rōpū Taua o Ingarangi)