millward stood for the party twice in cardiganshire at the 1966 general election and montgomeryshire in 1970, but was not elected. in 1966, he was elected as vice-president of plaid. he had just completed a two-year term as vice-president of plaid cymru when he was asked to teach welsh to prince charles ahead of his investiture as prince of wales. this took place over nine weeks at the university of wales, aberystwyth.