ɡwˈɪlɪm hɐz ɐpˈɪɹd ˌɔn tˈɛlᵻvˌɪʒən ɪn ɐ lˈɑːɹdʒ ɹˈeɪndʒ ʌv ʃˈoʊz, ɪŋklˈuːdɪŋ ðə bˈɪl, ˈʌltᵻmət fˈoːɹs, sˈoʊldʒɚ sˈoʊldʒɚ, kˌɔːɹənˈeɪʃən stɹˈiːt, lˈʌndənz bˈɜːnɪŋ, dˈænsɪŋ æt lʌɡnˈɑːsə, ænd ðə pɹəfˈɛʃənəlz.
Gwilym has appeared on television in a large range of shows, including The Bill, Ultimate Force, Soldier Soldier, Coronation Street, London's Burning, Dancing at Lughnasa, and The Professionals.