Mezue ahịrịokwu na-esonụ: Fenwick gbara rugby dịka nwata akwụkwọ maka Caerphilly Grammar Technical School, ma mesịa sonye na Taffs Well RFC. N'afọ 1971, ọ kwagara Beddau ebe ọ gbara egwuregwu iri ise na otu tupu ọ kwaga na otu egwuregwu nke mbụ Bridgend. Mgbe ọ nọ na Bridgend, Fenwick nwetara egwuregwu iri atọ ya niile maka Wales, na-eme mbido mbụ ya megide France na 1975, nke ọ gbara mbọ mgbe naanị nkeji ise gachara, wee mechie egwuregwu ahụ na ngụkọta nke isi 9. Ọ bụ onye òtù nke
1977 British Lions gara njem na New Zealand, nke ọ gbara na ule anọ niile. Ọ bụkwa onye isi ndị Wales na egwuregwu Centenary megide ndị All Blacks na 1980. Ọ gwakwara otu World XV na 9 Ọgọstụ 1980 megide Buenos Aires, tụfuru 36-22.