Vyvyan was mayor of Lostwithiel in 1632–33, 1636–1638 and 1640–41. He supported Parliament during the English Civil War and was probably present at the Battle of Lostwithiel in mid-1644 with the Earl of Essex's army. He held the post of comptroller of tin coinage until the abolition of the coinage in 1650, and by 1653 had settled in Plymouth. He died sometime between then and 22 April 1657.