He obtained a scholarship enabling him to attend Victoria College but failed the Oxford University entrance examination.
[2] During the War he served as a cypher instructor with the Special Operations Executive (SOE) in Beaulieu, New Forest before being promoted to Chief instructor of Force 136, the Asian outpost of the SOE in India.
Upon returning to Jersey after its liberation, Vibert co-founded a law firm with his brother, Vivian (Bob) and others.
During this time in elected office he was President of the following committees:[5] Defence (1967–1987), Legislation (1966–1981), Constitution and Common Market (1967–87), Industrial Relations (1972–1975), Establishment (1975–1980), Finance (1980–1984), Policy Advisory (1984–1987), Defence Contribution (1984–1987).
During his presidency of the Constitution and Common Market Committee, he was the author of the constitutional position that Jersey enjoyed of being outside the EEC (later the EU), but within the common external tariff, during the United Kingdom's membership 1972-2020.