 Nyorai kupfuurira kweiyi ndima - Dunning akabatana neRoyal Navy aine makore 18, uye akabatira kwamakore maviri. Gare gare akatarisira chitoro chemapepanhau uye akanga ariwo muchenesi wamahwindo. Sezvo akanga ari Yorkshire amateur champion pane gumi nerimwe nguva, uye CIU Championship muna 1963, 1966 uye 1969, Dunning akatendeuka nyanzvi muna 1971 pazera remakore 45. Akatamba mutambo wake wekutanga weWorld Championship muna 1972, paakarasikirwa naJohn Pulman mumutambo wekutanga, mushure mekurova Pat Houlihan naGraham Miles mukukodzera. Akabudisa kubudirira kwake kwakanakisisa muna 1974, paakasvika kumakwikwi ekupedzisira, achibva arasikirwa nemutambo wake neMiles 1315. Kuoneka kwokupedzisira kwaDunning mumatanho makuru echinoitika kwakauya muna 1982. 